Dropdownlist datasource dependency

Morris Neuman · Jan 13, 2009

Hi,

I have a gridview that has 2 dropdownlists.
DropDownList 4 is bound to AccessDataSource4.
DropDownList2 needs to be bound to a DataSourceID depending on the value of
DropDownList4.

For example, in insert mode, if the user selects value "Mailboxes" in
DropDownList4 then I want DropDownList2 to be bound to AccessDataSource2, if
not then AccessDataSource3.

I don't get any error, however the values in the dropdownlist in
DetailsView1 are not correct.

My code is as follows:

<%@ Page Language="C#" MasterPageFile="~/MasterPage1.master"
Title="Admin-Manage Web Account-Mailboxes" %>

<script runat="server">

protected void Page_Load(object sender, EventArgs e)
{
Label1.DataBind();
}

protected void LinkButton1_Click(object sender, EventArgs e)
{
DetailsView1.Visible = true;
}

protected void DetailsView1_ItemInserted(object sender,
DetailsViewInsertedEventArgs e)
{
GridView1.DataBind();
}

protected void DetailsView1_Prerender(object sender, EventArgs e)
{
DetailsView dv = (DetailsView)sender;

DropDownList DL2 = dv.FindControl("DropDownList2") as DropDownList;
DropDownList DL4 = dv.FindControl("DropDownList4") as DropDownList;

if (DL4.Text == "Mailboxes")
{
DL2.DataSourceID = "AccessDataSource2";
DL2.DataTextField = "BoxNumber";
DL2.DataValueField = "Boxnumber";
dv.DataBind();
}
else
{
DL2.DataSourceID = "AccessDataSource3";
DL2.DataTextField = "AttendantID";
DL2.DataValueField = "AttendantID";
dv.DataBind();
}
}

protected void DropDownList4_TableTypeSelectedIndexChanged(object
sender, EventArgs e)
{
DetailsView dv = (DetailsView)sender;

DropDownList DL2 = dv.FindControl("DropDownList2") as DropDownList;
DropDownList DL4 = dv.FindControl("DropDownList4") as DropDownList;

if (DL4.Text.ToString() == "Mailboxes")
{
DL2.DataSourceID = "AccessDataSource2";
DL2.DataTextField = "BoxNumber";
DL2.DataValueField = "Boxnumber";
dv.DataBind();
}
else
{
DL2.DataSourceID = "AccessDataSource3";
DL2.DataTextField = "AttendantID";
DL2.DataValueField = "AttendantID";
dv.DataBind();
}
}

</script>

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1"
Runat="Server">
<br />
<span style="color: navy; font-family: Verdana"><strong>Mailboxes for
Web Account </strong></span>
<asp:Label ID="Label1" runat="server" Text='<%#
Request.QueryString["User"] %>' Font-Names="Verdana" Font-Size="12pt"
Font-Bold="True" ForeColor="Navy"></asp:Label><br />
<br />
<asp:Menu ID="Menu2" runat="server" BackColor="#FFC080" BorderColor="Navy"
BorderStyle="Inset" BorderWidth="1px" Font-Bold="False"
Font-Strikeout="False"
Font-Underline="False" ForeColor="Navy" Orientation="Horizontal">
<StaticMenuStyle HorizontalPadding="5px" />
<StaticMenuItemStyle BackColor="#FFC080" Font-Names="verdana"
Font-Size="8pt"
HorizontalPadding="15px" />
<StaticHoverStyle Font-Bold="True" />
<Items>
<asp:MenuItem NavigateUrl="~/Default.aspx" Text="Message Center"
Value="Message Center" ToolTip="Review mailboxes for logged in web account">
</asp:MenuItem>
<asp:MenuItem
NavigateUrl="~/systemadminOnly/ManageCALLMaster.aspx" Text="Manage CALLMaster"
Value="Manage CALLMaster" ToolTip="Manage CALLMaster
databases"></asp:MenuItem>
<asp:MenuItem
NavigateUrl="~/systemadminOnly/ManageWebAccounts.aspx" Text="Manage Web
Accounts"
Value="Manage Web Accounts" ToolTip="Manage Web
Accounts"></asp:MenuItem>
<asp:MenuItem
NavigateUrl="http://localhost/aspnetadmin/defaul...MWebManager\&applicationUrl=/TestAspnetConfig"
Text="Manage Roles/Web Account via ASP.Net" Value="Manage
via ASP.Net" ToolTip="Must be locally connected to web server"></asp:MenuItem>
</Items>
</asp:Menu>

<br />
<span style="font-size: 10pt; font-family: Verdana; color:
navy;">Mailboxes</span>

<br />
<asp:GridView ID="GridView1" runat="server" AllowPaging="True"
AllowSorting="True"
AutoGenerateColumns="False"
DataKeyNames="WebAccountName,WebAccountID" DataSourceID="AccessDataSource1"
Font-Names="Verdana" Font-Size="8pt" BorderColor="#FFC080"
BorderStyle="Solid" BorderWidth="1px" CellPadding="5" CellSpacing="1"
ForeColor="Navy" ToolTip="Are you sure you want to delete this Mailbox for
this Web Account?">
<Columns>
<asp:TemplateField AccessibleHeaderText="Will Delete"
ShowHeader="False">
<ControlStyle ForeColor="DarkSlateGray" />
<ItemStyle BackColor="Lavender" BorderColor="SlateGray"
BorderStyle="Inset" BorderWidth="2px" />
<HeaderStyle BackColor="Lavender" />
<ItemTemplate>
<asp:LinkButton ID="LinkButton2" runat="server"
CommandName="Delete" OnClientClick="return confirm('Are you sure you want to
delete this Mailbox from this Web Account?');">Delete</asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="TableType"
SortExpression="TableType">
<EditItemTemplate>
<asp

ropDownList ID="DropDownList3" runat="server"
AutoPostBack="True"
DataSourceID="AccessDataSource4"
DataTextField="TableType"
DataValueField="TableType" SelectedValue='<%#
Bind("TableType") %>' >
</asp

ropDownList>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label3" runat="server" Text='<%#
Bind("TableType") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Type ID" SortExpression="TypeID">
<EditItemTemplate>
<asp

ropDownList ID="DropDownList1" runat="server"
SelectedValue='<%# Bind("TypeID") %>'
Width="109px">
</asp

ropDownList>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label2" runat="server" Text='<%#
Bind("TypeID") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="WebAccountID"
SortExpression="WebAccountID">
<EditItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%#
Bind("WebAccountID") %>'></asp:Label>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%#
Bind("WebAccountID") %>'></asp:Label>
</ItemTemplate>
<ItemStyle Width="0px" />
<HeaderStyle Width="0px" />
</asp:TemplateField>
<asp:BoundField DataField="WebAccountName"
HeaderText="WebAccountName"
SortExpression="WebAccountName" InsertVisible="False"
Visible="False" />
</Columns>
<EmptyDataTemplate>
There are no mailboxes associated with this user.
</EmptyDataTemplate>
<RowStyle BackColor="BlanchedAlmond" />
<HeaderStyle BackColor="#FFC080" BorderColor="#FFC080" />
<AlternatingRowStyle BackColor="SeaShell" />
<PagerSettings Mode="NumericFirstLast" Position="TopAndBottom" />
</asp:GridView>
<br />
<br />
<br />
<asp:LinkButton ID="LinkButton1" runat="server"
OnClick="LinkButton1_Click" Font-Names="verdana" Font-Size="8pt"
BackColor="Lavender" BorderColor="SlateGray" BorderStyle="Inset"
BorderWidth="1px" ForeColor="DarkSlateGray">Add Mailboxes</asp:LinkButton><br
/>
<br />
<asp

etailsView ID="DetailsView1" runat="server"
AutoGenerateInsertButton="True"
AutoGenerateRows="False" DataSourceID="AccessDataSource1"
DefaultMode="Insert"
Height="50px" Visible="False" Width="276px" Font-Names="Verdana"
Font-Size="8pt" OnPreRender="DetailsView1_Prerender"
BorderStyle="Solid" BorderWidth="1px" ForeColor="Navy"
BorderColor="#FFC080" ToolTip="Correct Mailbox Selected?">
<Fields>
<asp:BoundField DataField="WebAccountID"
HeaderText="WebAccountID"
InsertVisible="False" SortExpression="WebAccountID" />
<asp:BoundField DataField="WebAccountName"
HeaderText="WebAccountName" InsertVisible="False"
SortExpression="WebAccountName" />
<asp:TemplateField HeaderText="TableType"
SortExpression="TableType">
<EditItemTemplate>
<asp:TextBox ID="TextBox2" runat="server" Text='<%#
Bind("TableType") %>'></asp:TextBox>
</EditItemTemplate>
<InsertItemTemplate>
<asp

ropDownList ID="DropDownList4" runat="server"
DataSourceID="AccessDataSource4"
DataTextField="TableType"
DataValueField="TableType" SelectedValue='<%#
Bind("TableType") %>'
OnSelectedIndexChanged="DropDownList4_TableTypeSelectedIndexChanged">
</asp

ropDownList>
</InsertItemTemplate>
<ItemTemplate>
<asp:Label ID="Label2" runat="server" Text='<%#
Bind("TableType") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="TypeID" SortExpression="TypeID">
<EditItemTemplate>
<asp:TextBox ID="TextBox1" runat="server" Text='<%#
Bind("BoxNumber") %>'></asp:TextBox>
</EditItemTemplate>
<InsertItemTemplate>
<asp

ropDownList ID="DropDownList2" runat="server"
DataSourceID="AccessDataSource2"
DataTextField="BoxNumber"
DataValueField="BoxNumber" SelectedValue='<%#
Bind("BoxNumber") %>'
Width="150px">
</asp

ropDownList>
</InsertItemTemplate>
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%#
Bind("TypeID") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:CommandField InsertVisible="False" ShowInsertButton="True" >
<ControlStyle Font-Names="Verdana" />
</asp:CommandField>
</Fields>
<CommandRowStyle BackColor="Lavender" BorderColor="SlateGray"
BorderStyle="Inset"
BorderWidth="2px" ForeColor="DarkSlateGray" />
<HeaderStyle BackColor="#FFC080" BorderColor="#FFC080" />
<FieldHeaderStyle BackColor="#FFC080" />
<InsertRowStyle Width="100px" />
</asp

etailsView>
<br />
<asp:AccessDataSource ID="AccessDataSource1" runat="server"
DataFile="<%$ ConnectionStrings:CALLMasterMDB %>"

SelectCommand="SELECT [WebAccountID], [WebAccountName], [TableType],
[TypeID] FROM [WebAccount] WHERE ([WebAccountName] = ?) ORDER BY
[WebAccountName], [TableType], [TypeID]"
DeleteCommand="DELETE FROM [WebAccount] WHERE [WebAccountID] = ?"
InsertCommand="INSERT INTO [WebAccount] ([WebAccountName], [TypeID],
[TableType]) VALUES (?, ?, ?)"
UpdateCommand="UPDATE WebAccount SET TypeID = ?, TableType = ? WHERE
(WebAccountID = ?)">
<SelectParameters>
<asp:QueryStringParameter Name="WebAccountName"
QueryStringField="User"
Type="String" />
</SelectParameters>
<DeleteParameters>
<asp

arameter Name="WebAccountID" Type="Int32" />
</DeleteParameters>
<UpdateParameters>
<asp

arameter Name="TypeID" Type="String" />
<asp

arameter Name="TableType" Type="String" />
<asp

arameter Name="WebAccountID" Type="Int32" />
</UpdateParameters>
<InsertParameters>
<asp:QueryStringParameter Name="WebAccountName"
QueryStringField="User"
Type="String" />
<asp

arameter Name="TypeID" Type="String" />
<asp

arameter Name="TableType" />
</InsertParameters>
</asp:AccessDataSource>
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:CallMasterSQLConnectionString %>"

DeleteCommand="DELETE FROM [WebAccount] WHERE [WebAccountID] =
@WebAccountID" InsertCommand="INSERT INTO [WebAccount] ([WebAccountName],
[TypeID], [TableType]) VALUES (@WebAccountName, @TypeID, @TableType)"
SelectCommand="SELECT [WebAccountID], [WebAccountName], [TableType],
[TypeID] FROM [WebAccount] WHERE ([WebAccountName] = @WebAccountName) ORDER
BY [WebAccountName], [TableType], [TypeID]"

UpdateCommand="UPDATE WebAccount SET TypeID = @TypeID, TableType =
@TableType WHERE (WebAccountID = @WebAccountID)">
<DeleteParameters>
<asp

arameter Name="WebAccountID" Type="Int32" />
</DeleteParameters>
<UpdateParameters>
<asp

arameter Name="TypeID" Type="String" />
<asp

arameter Name="WebAccountID" Type="Int32" />
<asp

arameter Name="TableType" />
</UpdateParameters>
<SelectParameters>
<asp:QueryStringParameter Name="WebAccountName"
QueryStringField="User"
Type="String" />
</SelectParameters>
<InsertParameters>
<asp:QueryStringParameter Name="WebAccountName"
QueryStringField="User"
Type="String" />
<asp

arameter Name="TypeID" Type="String" />
<asp

arameter Name="TableType" />
</InsertParameters>
</asp:SqlDataSource>
<asp:AccessDataSource ID="AccessDataSource2" runat="server"
DataFile="C:\Program Files\CallMaster\Data\Callmaster.mdb"
SelectCommand="SELECT BoxNumber FROM Mailboxes ORDER BY BoxNumber">
</asp:AccessDataSource>
<asp:SqlDataSource ID="SqlDataSource2" runat="server"
ConnectionString="<%$ ConnectionStrings:CallMasterSQLConnectionString %>"
SelectCommand="SELECT [BoxNumber] FROM [Mailboxes] ORDER BY
[BoxNumber]">
</asp:SqlDataSource>
<asp:AccessDataSource ID="AccessDataSource3" runat="server"
DataFile="C:\Program Files\CallMaster\Data\Callmaster.mdb"

SelectCommand="SELECT AttendantID FROM Attendant GROUP BY
AttendantID ORDER BY AttendantID">
</asp:AccessDataSource>
<asp:SqlDataSource ID="SqlDataSource3" runat="server"
ConnectionString="<%$ ConnectionStrings:CallMasterSQLConnectionString %>"

SelectCommand="SELECT AttendantID FROM Attendant GROUP BY
AttendantID ORDER BY AttendantID">
</asp:SqlDataSource>
<asp:AccessDataSource ID="AccessDataSource4" runat="server"
DataFile="C:\Program Files\CallMaster\Data\Callmaster.mdb"

SelectCommand="SELECT TableType FROM WebAccountTableType ORDER BY
TableType">
</asp:AccessDataSource>
<asp:SqlDataSource ID="SqlDataSource4" runat="server"
ConnectionString="<%$ ConnectionStrings:CallMasterSQLConnectionString %>"

SelectCommand="SELECT TableType FROM WebAccountTableType ORDER BY
TableType">
</asp:SqlDataSource>
<asp:HyperLink ID="HyperLink2" runat="server" Font-Names="Verdana"
Font-Size="8pt"
NavigateUrl="~/systemadminOnly/Registration.aspx" ToolTip="Quick Add
Users for Website Access"
Width="131px">Add Web Account</asp:HyperLink>
<br />
<br />
<asp:HyperLink ID="HyperLink7" runat="server"
Font-Names="Verdana" Font-Size="8pt"
NavigateUrl="~/Default.aspx" ToolTip="Review Account Mailboxes, Messages,
Notifications"
Width="145px">Message Center</asp:HyperLink><asp:HyperLink
ID="HyperLink6" runat="server"
Font-Names="Verdana" Font-Size="8pt"
NavigateUrl="~/systemadminOnly/ManageCALLMaster.aspx"
ToolTip="Maintain CALLMaster Database" Visible='<%#
User.IsInRole("systemadmin") %>'
Width="156px">Manage CALLMaster</asp:HyperLink>

<asp:HyperLink ID="HyperLink9" runat="server"
Font-Names="Verdana" Font-Size="8pt"
NavigateUrl="~/SystemAdminOnly/ManageWebAccounts.aspx"
ToolTip="Manage Web Accounts" Visible='<%#
User.IsInRole("systemadmin") %>'
Width="156px">Manage Web Accounts</asp:HyperLink>

<asp:HyperLink ID="HyperLink8" runat="server" Font-Names="Verdana"
Font-Size="8pt"

NavigateUrl="http://localhost/aspnetadmin/defaul...MWebManager\&applicationUrl=/TestAspnetConfig"
ToolTip="From Local Machine ONLY" Width="242px">Manage Roles/Web
Account via ASP.Net</asp:HyperLink><br />
<br />
</asp:Content>

Steven Cheng · Jan 13, 2009

Hi Morris,

From your description, you use DetailsView to do some record inserting in
ASP.NET application. And the DetailsView InsertTemplate contains two
dropdownlists. You want to make one of the dropdownlist populate items
depending on another dropdownlist's selected value(and bound data from a
selected datasource control), correct?

According to the page markup and code you provided, I think you have hooked
up too much functions. Based on my test, I think what you need to do is the
following two steps:

1. Make sure that the DDL2 (which will bind data depending on DDL4) has a
default datasource and data/text field assigned. Also, DDL4 has to set a
default selected item(that matches DDL2's default databind setting).
Thus, when the page first load or after you've inserted a record, the DDL4
and DDL2 will return to the default status.

2. You need to register DDL4's "SelectedIndexChanged" event and rebind DDL2
at that time(according to DDL4's current selected value).

Since your page is a bit too big(with other controls and style stuffs),
I've created a simplified test page here, you can refer to it and modify
your page according to it:

=========aspx ==============
<%@ Page Language="C#" AutoEventWireup="true"
CodeBehind="DropDownTestPage.aspx.cs"
Inherits="WebApplication1.DropDownTestPage" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>

<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:testdbConnectionString
%>"
DeleteCommand="DELETE FROM [table1] WHERE [t1_id] = @t1_id"
InsertCommand="INSERT INTO [table1] ([t1_name]) VALUES
(@t1_name)"
SelectCommand="SELECT [t1_id], [t1_name] FROM [table1]"
UpdateCommand="UPDATE [table1] SET [t1_name] = @t1_name WHERE
[t1_id] = @t1_id">
<DeleteParameters>
<asp

arameter Name="t1_id" Type="Int32" />
</DeleteParameters>
<UpdateParameters>
<asp

arameter Name="t1_name" Type="String" />
<asp

arameter Name="t1_id" Type="Int32" />
</UpdateParameters>
<InsertParameters>
<asp

arameter Name="t1_name" Type="String" />
</InsertParameters>
</asp:SqlDataSource>

</div>
<asp

etailsView ID="DetailsView1" runat="server"
AutoGenerateRows="False"
DataKeyNames="t1_id" DataSourceID="SqlDataSource1"
DefaultMode="Insert"
Height="50px" Width="125px" OnLoad="DetailsView1_Load">

<Fields>
<asp:BoundField DataField="t1_id" HeaderText="t1_id"
InsertVisible="False"
ReadOnly="True" SortExpression="t1_id" />
<asp:BoundField DataField="t1_name" HeaderText="t1_name"
SortExpression="t1_name" />
<asp:TemplateField HeaderText="Template Field" >
<InsertItemTemplate>

Table Type:<asp:dropdownlist ID="DDL4" runat="server"
AutoPostBack="True"
onselectedindexchanged="DDL4_SelectedIndexChanged">
<asp:ListItem Selected="True" >Table1</asp:ListItem>
<asp:ListItem>Table2</asp:ListItem>
</asp:dropdownlist>

<br />
Items:<asp:dropdownlist ID="DDL2" runat="server"
DataTextField="message"
DataValueField="message"
DataSourceID="SqlDataSource2"></asp:dropdownlist>

</InsertItemTemplate>
</asp:TemplateField>
<asp:CommandField ShowInsertButton="True" />
</Fields>
</asp

etailsView>
<asp:SqlDataSource ID="SqlDataSource2" runat="server"
ConnectionString="<%$ ConnectionStrings:logdbConnectionString %>"
SelectCommand="SELECT [message] FROM [tb_logs]"></asp:SqlDataSource>
<asp:SqlDataSource ID="SqlDataSource3" runat="server"
ConnectionString="<%$ ConnectionStrings:logdbConnectionString %>"
SelectCommand="SELECT [id] FROM [tb_logs]"></asp:SqlDataSource>
<br />
<asp:Button ID="Button1" runat="server" Text="Button" />
</form>
</body>
</html>

===========code behind===================
public partial class DropDownTestPage : System.Web.UI.Page
{

protected void DDL4_SelectedIndexChanged(object sender, EventArgs e)
{
DropDownList ddl2 = DetailsView1.FindControl("DDL2") as
DropDownList;
DropDownList ddl4 = DetailsView1.FindControl("DDL4") as
DropDownList;

string DDL4_VALUE = ddl4.SelectedValue;

if (DDL4_VALUE == "Table1")
{
ddl2.DataSourceID = "SqlDataSource2";
ddl2.DataTextField = ddl2.DataValueField = "message";
}
else
{
ddl2.DataSourceID = "SqlDataSource3";
ddl2.DataTextField = ddl2.DataValueField = "id";
}

ddl2.DataBind();
}

protected void DetailsView1_Load(object sender, EventArgs e)
{

}

}

==================================

If there is anything unclear on this, please feel free to let me know.

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead

Delighting our customers is our #1 priority. We welcome your comments and
suggestions about how we can improve the support we provide to you. Please
feel free to let my manager know what you think of the level of service
provided. You can send feedback directly to my manager at:
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--------------------

From: =?Utf-8?B?TW9ycmlzIE5ldW1hbg==?= <[email protected]>
Subject: Dropdownlist datasource dependency
Date: Mon, 12 Jan 2009 21:33:01 -0800

Hi,

I have a gridview that has 2 dropdownlists.
DropDownList 4 is bound to AccessDataSource4.
DropDownList2 needs to be bound to a DataSourceID depending on the value of
DropDownList4.

For example, in insert mode, if the user selects value "Mailboxes" in
DropDownList4 then I want DropDownList2 to be bound to AccessDataSource2, if
not then AccessDataSource3.

I don't get any error, however the values in the dropdownlist in
DetailsView1 are not correct.

My code is as follows:

<%@ Page Language="C#" MasterPageFile="~/MasterPage1.master"
Title="Admin-Manage Web Account-Mailboxes" %>

<script runat="server">

protected void Page_Load(object sender, EventArgs e)
{
Label1.DataBind();
}

protected void LinkButton1_Click(object sender, EventArgs e)
{
DetailsView1.Visible = true;
}

protected void DetailsView1_ItemInserted(object sender,
DetailsViewInsertedEventArgs e)
{
GridView1.DataBind();
}

protected void DetailsView1_Prerender(object sender, EventArgs e)
{
DetailsView dv = (DetailsView)sender;

DropDownList DL2 = dv.FindControl("DropDownList2") as DropDownList;
DropDownList DL4 = dv.FindControl("DropDownList4") as DropDownList;

if (DL4.Text == "Mailboxes")
{
DL2.DataSourceID = "AccessDataSource2";
DL2.DataTextField = "BoxNumber";
DL2.DataValueField = "Boxnumber";
dv.DataBind();
}
else
{
DL2.DataSourceID = "AccessDataSource3";
DL2.DataTextField = "AttendantID";
DL2.DataValueField = "AttendantID";
dv.DataBind();
}
}

protected void DropDownList4_TableTypeSelectedIndexChanged(object
sender, EventArgs e)
{
DetailsView dv = (DetailsView)sender;

DropDownList DL2 = dv.FindControl("DropDownList2") as DropDownList;
DropDownList DL4 = dv.FindControl("DropDownList4") as DropDownList;

if (DL4.Text.ToString() == "Mailboxes")
{
DL2.DataSourceID = "AccessDataSource2";
DL2.DataTextField = "BoxNumber";
DL2.DataValueField = "Boxnumber";
dv.DataBind();
}
else
{
DL2.DataSourceID = "AccessDataSource3";
DL2.DataTextField = "AttendantID";
DL2.DataValueField = "AttendantID";
dv.DataBind();
}
}

</script>

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1"
Runat="Server">
<br />
<span style="color: navy; font-family: Verdana"><strong>Mailboxes for
Web Account </strong></span>
<asp:Label ID="Label1" runat="server" Text='<%#
Request.QueryString["User"] %>' Font-Names="Verdana" Font-Size="12pt"
Font-Bold="True" ForeColor="Navy"></asp:Label><br />
<br />
<asp:Menu ID="Menu2" runat="server" BackColor="#FFC080" BorderColor="Navy"
BorderStyle="Inset" BorderWidth="1px" Font-Bold="False"
Font-Strikeout="False"
Font-Underline="False" ForeColor="Navy" Orientation="Horizontal">
<StaticMenuStyle HorizontalPadding="5px" />
<StaticMenuItemStyle BackColor="#FFC080" Font-Names="verdana"
Font-Size="8pt"
HorizontalPadding="15px" />
<StaticHoverStyle Font-Bold="True" />
<Items>
<asp:MenuItem NavigateUrl="~/Default.aspx" Text="Message Center"
Value="Message Center" ToolTip="Review mailboxes for logged in web account">
</asp:MenuItem>
<asp:MenuItem
NavigateUrl="~/systemadminOnly/ManageCALLMaster.aspx" Text="Manage CALLMaster"
Value="Manage CALLMaster" ToolTip="Manage CALLMaster
databases"></asp:MenuItem>
<asp:MenuItem
NavigateUrl="~/systemadminOnly/ManageWebAccounts.aspx" Text="Manage Web
Accounts"
Value="Manage Web Accounts" ToolTip="Manage Web
Accounts"></asp:MenuItem>
<asp:MenuItem
NavigateUrl="http://localhost/aspnetadmin/default.aspx?applicationPhysicalP ath=C:\Inetpub\wwwroot\CMWebManager\&applicationUrl=/TestAspnetConfig"
Text="Manage Roles/Web Account via ASP.Net" Value="Manage
via ASP.Net" ToolTip="Must be locally connected to web

server"> said:
</Items>
</asp:Menu>

<br />
<span style="font-size: 10pt; font-family: Verdana; color:
navy;">Mailboxes</span>

<br />
<asp:GridView ID="GridView1" runat="server" AllowPaging="True"
AllowSorting="True"
AutoGenerateColumns="False"
DataKeyNames="WebAccountName,WebAccountID" DataSourceID="AccessDataSource1"
Font-Names="Verdana" Font-Size="8pt" BorderColor="#FFC080"
BorderStyle="Solid" BorderWidth="1px" CellPadding="5" CellSpacing="1"
ForeColor="Navy" ToolTip="Are you sure you want to delete this Mailbox for
this Web Account?">
<Columns>

Morris Neuman · Jan 14, 2009

Hi,

Thanks for the help. I tried to apply your sample code to my web page and
get error:
Exception Details: System.InvalidOperationException: Databinding methods
such as Eval(), XPath(), and Bind() can only be used in the context of a
databound control.

The page loads and I can click on LinkButton1 to view the DetailsView1. I
see "Attendant" value in DropDownList4 per the default set in the
DetailsView1_Prerender. DropDownList2 is bound to AccessDataSource3 so it is
in sync with the "Attendant" value in DropDownList4.

I get this error when I use DropDownList4 and select value "Mailboxes". In
the debugging I see that the error occurs when the programs executes the
DL2.DataBind() statement in the DropDownList4_TableTypeSelectedIndexChanged
script section.

My abbreviated code is as follows:

<%@ Page Language="C#" MasterPageFile="~/MasterPage1.master"
Title="Admin-Manage Web Account-Mailboxes" %>

<script runat="server">

protected void Page_Load(object sender, EventArgs e)
{
Label1.DataBind();
}

protected void LinkButton1_Click(object sender, EventArgs e)
{
DetailsView1.Visible = true;

}

protected void DetailsView1_Prerender(object sender, EventArgs e)
{
DetailsView dv = (DetailsView)sender;

DropDownList DL4 = dv.FindControl("DropDownList4") as DropDownList;
String TableType_Default = "Attendant" as string;
DL4.Text = TableType_Default;
}

protected void DetailsView1_Load(object sender, EventArgs e)
{

}

protected void DropDownList4_TableTypeSelectedIndexChanged(object
sender, EventArgs e)
{

DropDownList DL2 = DetailsView1.FindControl("DropDownList2") as
DropDownList;
DropDownList DL4 = DetailsView1.FindControl("DropDownList4") as
DropDownList;

string DL4_Value = DL4.SelectedValue;

if (DL4_Value == "Mailboxes")
{
DL2.DataSourceID = "AccessDataSource2";
DL2.DataTextField = "BoxNumber";
DL2.DataValueField = "Boxnumber";
}
else
{
DL2.DataSourceID = "AccessDataSource3";
DL2.DataTextField = "AttendantID";
DL2.DataValueField = "AttendantID";
}

DL2.DataBind();
}

</script>

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1"
Runat="Server">
<br />
<span style="color: navy; font-family: Verdana"><strong>Table Types for
Web Account </strong></span>
<asp:Label ID="Label1" runat="server" Text='<%#
Request.QueryString["User"] %>' Font-Names="Verdana" Font-Size="12pt"
Font-Bold="True" ForeColor="Navy"></asp:Label><br />
<br />


<br />

<br />
<br />
<asp:LinkButton ID="LinkButton1" runat="server"
OnClick="LinkButton1_Click" Font-Names="verdana" Font-Size="8pt"
BackColor="Lavender" BorderColor="SlateGray" BorderStyle="Inset"
BorderWidth="1px" ForeColor="DarkSlateGray">Add Table
Types</asp:LinkButton><br />
<br />

<asp

etailsView ID="DetailsView1" runat="server"
AutoGenerateInsertButton="True"
AutoGenerateRows="False" DataSourceID="AccessDataSource1"
DefaultMode="Insert"
Height="50px" Visible="False" Width="276px" Font-Names="Verdana"
Font-Size="8pt" OnPreRender="DetailsView1_Prerender"
BorderStyle="Solid" BorderWidth="1px" ForeColor="Navy"
BorderColor="#FFC080" ToolTip="Correct Mailbox Selected?"
DataKeyNames="WebAccountName,WebAccountID">
<Fields>
<asp:BoundField DataField="WebAccountID"
HeaderText="WebAccountID"
InsertVisible="False" SortExpression="WebAccountID" />
<asp:BoundField DataField="WebAccountName"
HeaderText="WebAccountName" InsertVisible="False"
SortExpression="WebAccountName" />
<asp:TemplateField HeaderText="TableType"
SortExpression="TableType">
<InsertItemTemplate>
<asp

ropDownList ID="DropDownList4" runat="server"
DataSourceID="AccessDataSource4"
DataTextField="WTableType" AutoPostBack="True"
DataValueField="WTableType" SelectedValue='<%#
Bind("TableType") %>'

OnSelectedIndexChanged="DropDownList4_TableTypeSelectedIndexChanged">
</asp

ropDownList>
</InsertItemTemplate>
<ItemTemplate>
<asp:Label ID="Label2" runat="server" Text='<%#
Bind("TableType") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="TypeID" SortExpression="TypeID">
<InsertItemTemplate>
<asp

ropDownList ID="DropDownList2" runat="server"
DataSourceID="AccessDataSource3"
DataTextField="AttendantID"
DataValueField="AttendantID" SelectedValue='<%#
Bind("TypeID") %>'
Width="150px">
</asp

ropDownList>
</InsertItemTemplate>
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%#
Bind("TypeID") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:CommandField InsertVisible="False" ShowInsertButton="True" >
<ControlStyle Font-Names="Verdana" />
</asp:CommandField>
</Fields>
<CommandRowStyle BackColor="Lavender" BorderColor="SlateGray"
BorderStyle="Inset"
BorderWidth="2px" ForeColor="DarkSlateGray" />
<HeaderStyle BackColor="#FFC080" BorderColor="#FFC080" />
<FieldHeaderStyle BackColor="#FFC080" />
<InsertRowStyle Width="100px" />
</asp

etailsView>
<br />

<asp:AccessDataSource ID="AccessDataSource1" runat="server"
DataFile="<%$ ConnectionStrings:CALLMasterMDB %>"
SelectCommand="SELECT [WebAccountID], [WebAccountName], [TableType],
[TypeID] FROM [WebAccount] WHERE ([WebAccountName] = ?) ORDER BY
[WebAccountName], [TableType], [TypeID]"
DeleteCommand="DELETE FROM [WebAccount] WHERE [WebAccountID] = ?"
InsertCommand="INSERT INTO [WebAccount] ([WebAccountName], [TypeID],
[TableType]) VALUES (?, ?, ?)"
UpdateCommand="UPDATE WebAccount SET TypeID = ?, TableType = ? WHERE
(WebAccountID = ?)">
<SelectParameters>
<asp:QueryStringParameter Name="WebAccountName"
QueryStringField="User"
Type="String" />
</SelectParameters>
<DeleteParameters>
<asp

arameter Name="WebAccountID" Type="Int32" />
</DeleteParameters>
<UpdateParameters>
<asp

arameter Name="TypeID" Type="String" />
<asp

arameter Name="TableType" Type="String" />
<asp

arameter Name="WebAccountID" Type="Int32" />
</UpdateParameters>
<InsertParameters>
<asp:QueryStringParameter Name="WebAccountName"
QueryStringField="User"
Type="String" />
<asp

arameter Name="TypeID" Type="String" />
<asp

arameter Name="TableType" />
</InsertParameters>
</asp:AccessDataSource>

<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:CallMasterSQLConnectionString %>"
DeleteCommand="DELETE FROM [WebAccount] WHERE [WebAccountID] =
@WebAccountID" InsertCommand="INSERT INTO [WebAccount] ([WebAccountName],
[TypeID], [TableType]) VALUES (@WebAccountName, @TypeID, @TableType)"
SelectCommand="SELECT [WebAccountID], [WebAccountName], [TableType],
[TypeID] FROM [WebAccount] WHERE ([WebAccountName] = @WebAccountName) ORDER
BY [WebAccountName], [TableType], [TypeID]"
UpdateCommand="UPDATE WebAccount SET TypeID = @TypeID, TableType =
@TableType WHERE (WebAccountID = @WebAccountID)">
<DeleteParameters>
<asp

arameter Name="WebAccountID" Type="Int32" />
</DeleteParameters>
<UpdateParameters>
<asp

arameter Name="TypeID" Type="String" />
<asp

arameter Name="WebAccountID" Type="Int32" />
<asp

arameter Name="TableType" />
</UpdateParameters>
<SelectParameters>
<asp:QueryStringParameter Name="WebAccountName"
QueryStringField="User"
Type="String" />
</SelectParameters>
<InsertParameters>
<asp:QueryStringParameter Name="WebAccountName"
QueryStringField="User"
Type="String" />
<asp

arameter Name="TypeID" Type="String" />
<asp

arameter Name="TableType" />
</InsertParameters>
</asp:SqlDataSource>

<asp:AccessDataSource ID="AccessDataSource2" runat="server"
DataFile="C:\Program Files\CallMaster\Data\Callmaster.mdb"
SelectCommand="SELECT BoxNumber FROM Mailboxes ORDER BY BoxNumber">
</asp:AccessDataSource>
<asp:SqlDataSource ID="SqlDataSource2" runat="server"
ConnectionString="<%$ ConnectionStrings:CallMasterSQLConnectionString %>"
SelectCommand="SELECT [BoxNumber] FROM [Mailboxes] ORDER BY
[BoxNumber]">
</asp:SqlDataSource>
<asp:AccessDataSource ID="AccessDataSource3" runat="server"
DataFile="C:\Program Files\CallMaster\Data\Callmaster.mdb"
SelectCommand="SELECT AttendantID FROM Attendant GROUP BY
AttendantID ORDER BY AttendantID">
</asp:AccessDataSource>
<asp:SqlDataSource ID="SqlDataSource3" runat="server"
ConnectionString="<%$ ConnectionStrings:CallMasterSQLConnectionString %>"
SelectCommand="SELECT AttendantID FROM Attendant GROUP BY
AttendantID ORDER BY AttendantID">
</asp:SqlDataSource>
<asp:AccessDataSource ID="AccessDataSource4" runat="server"
DataFile="C:\Program Files\CallMaster\Data\Callmaster.mdb"
SelectCommand="SELECT WTableType FROM WebAccountTableType ORDER BY
WTableType">
</asp:AccessDataSource>
<asp:SqlDataSource ID="SqlDataSource4" runat="server"
ConnectionString="<%$ ConnectionStrings:CallMasterSQLConnectionString %>"
SelectCommand="SELECT TableType FROM WebAccountTableType ORDER BY
TableType">
</asp:SqlDataSource>
<br />
</asp:Content>

I hope you will point me in the correct direction.

--
Thanks
Morris

"Steven Cheng" said:
Hi Morris,

From your description, you use DetailsView to do some record inserting in
ASP.NET application. And the DetailsView InsertTemplate contains two
dropdownlists. You want to make one of the dropdownlist populate items
depending on another dropdownlist's selected value(and bound data from a
selected datasource control), correct?

According to the page markup and code you provided, I think you have hooked
up too much functions. Based on my test, I think what you need to do is the
following two steps:

1. Make sure that the DDL2 (which will bind data depending on DDL4) has a
default datasource and data/text field assigned. Also, DDL4 has to set a
default selected item(that matches DDL2's default databind setting).
Thus, when the page first load or after you've inserted a record, the DDL4
and DDL2 will return to the default status.

2. You need to register DDL4's "SelectedIndexChanged" event and rebind DDL2
at that time(according to DDL4's current selected value).

Since your page is a bit too big(with other controls and style stuffs),
I've created a simplified test page here, you can refer to it and modify
your page according to it:

=========aspx ==============
<%@ Page Language="C#" AutoEventWireup="true"
CodeBehind="DropDownTestPage.aspx.cs"
Inherits="WebApplication1.DropDownTestPage" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>

<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:testdbConnectionString
%>"
DeleteCommand="DELETE FROM [table1] WHERE [t1_id] = @t1_id"
InsertCommand="INSERT INTO [table1] ([t1_name]) VALUES
(@t1_name)"
SelectCommand="SELECT [t1_id], [t1_name] FROM [table1]"
UpdateCommand="UPDATE [table1] SET [t1_name] = @t1_name WHERE
[t1_id] = @t1_id">
<DeleteParameters>
<asparameter Name="t1_id" Type="Int32" />
</DeleteParameters>
<UpdateParameters>
<asparameter Name="t1_name" Type="String" />
<asparameter Name="t1_id" Type="Int32" />
</UpdateParameters>
<InsertParameters>
<asparameter Name="t1_name" Type="String" />
</InsertParameters>
</asp:SqlDataSource>

</div>
<aspetailsView ID="DetailsView1" runat="server"
AutoGenerateRows="False"
DataKeyNames="t1_id" DataSourceID="SqlDataSource1"
DefaultMode="Insert"
Height="50px" Width="125px" OnLoad="DetailsView1_Load">

<Fields>
<asp:BoundField DataField="t1_id" HeaderText="t1_id"
InsertVisible="False"
ReadOnly="True" SortExpression="t1_id" />
<asp:BoundField DataField="t1_name" HeaderText="t1_name"
SortExpression="t1_name" />
<asp:TemplateField HeaderText="Template Field" >
<InsertItemTemplate>

Table Type:<asp:dropdownlist ID="DDL4" runat="server"
AutoPostBack="True"
onselectedindexchanged="DDL4_SelectedIndexChanged">
<asp:ListItem Selected="True" >Table1</asp:ListItem>
<asp:ListItem>Table2</asp:ListItem>
</asp:dropdownlist>

<br />
Items:<asp:dropdownlist ID="DDL2" runat="server"
DataTextField="message"
DataValueField="message"
DataSourceID="SqlDataSource2"></asp:dropdownlist>

</InsertItemTemplate>
</asp:TemplateField>
<asp:CommandField ShowInsertButton="True" />
</Fields>
</aspetailsView>
<asp:SqlDataSource ID="SqlDataSource2" runat="server"
ConnectionString="<%$ ConnectionStrings:logdbConnectionString %>"
SelectCommand="SELECT [message] FROM [tb_logs]"></asp:SqlDataSource>
<asp:SqlDataSource ID="SqlDataSource3" runat="server"
ConnectionString="<%$ ConnectionStrings:logdbConnectionString %>"
SelectCommand="SELECT [id] FROM [tb_logs]"></asp:SqlDataSource>
<br />
<asp:Button ID="Button1" runat="server" Text="Button" />
</form>
</body>
</html>

===========code behind===================
public partial class DropDownTestPage : System.Web.UI.Page
{

protected void DDL4_SelectedIndexChanged(object sender, EventArgs e)
{
DropDownList ddl2 = DetailsView1.FindControl("DDL2") as
DropDownList;
DropDownList ddl4 = DetailsView1.FindControl("DDL4") as
DropDownList;

string DDL4_VALUE = ddl4.SelectedValue;

if (DDL4_VALUE == "Table1")
{
ddl2.DataSourceID = "SqlDataSource2";
ddl2.DataTextField = ddl2.DataValueField = "message";
}
else
{
ddl2.DataSourceID = "SqlDataSource3";
ddl2.DataTextField = ddl2.DataValueField = "id";
}

ddl2.DataBind();
}

protected void DetailsView1_Load(object sender, EventArgs e)
{

}

}

==================================

If there is anything unclear on this, please feel free to let me know.

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead

Delighting our customers is our #1 priority. We welcome your comments and
suggestions about how we can improve the support we provide to you. Please
feel free to let my manager know what you think of the level of service
provided. You can send feedback directly to my manager at:
(e-mail address removed).

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--------------------

From: =?Utf-8?B?TW9ycmlzIE5ldW1hbg==?= <[email protected]>
Subject: Dropdownlist datasource dependency
Date: Mon, 12 Jan 2009 21:33:01 -0800

Click to expand...

Hi,

I have a gridview that has 2 dropdownlists.
DropDownList 4 is bound to AccessDataSource4.
DropDownList2 needs to be bound to a DataSourceID depending on the value of
DropDownList4.

For example, in insert mode, if the user selects value "Mailboxes" in
DropDownList4 then I want DropDownList2 to be bound to AccessDataSource2, if
not then AccessDataSource3.

I don't get any error, however the values in the dropdownlist in
DetailsView1 are not correct.

My code is as follows:

<%@ Page Language="C#" MasterPageFile="~/MasterPage1.master"
Title="Admin-Manage Web Account-Mailboxes" %>

<script runat="server">

protected void Page_Load(object sender, EventArgs e)
{
Label1.DataBind();
}

protected void LinkButton1_Click(object sender, EventArgs e)
{
DetailsView1.Visible = true;
}

protected void DetailsView1_ItemInserted(object sender,
DetailsViewInsertedEventArgs e)
{
GridView1.DataBind();
}

protected void DetailsView1_Prerender(object sender, EventArgs e)
{
DetailsView dv = (DetailsView)sender;

DropDownList DL2 = dv.FindControl("DropDownList2") as DropDownList;
DropDownList DL4 = dv.FindControl("DropDownList4") as DropDownList;

if (DL4.Text == "Mailboxes")
{
DL2.DataSourceID = "AccessDataSource2";
DL2.DataTextField = "BoxNumber";
DL2.DataValueField = "Boxnumber";
dv.DataBind();
}
else
{
DL2.DataSourceID = "AccessDataSource3";
DL2.DataTextField = "AttendantID";
DL2.DataValueField = "AttendantID";
dv.DataBind();
}
}

protected void DropDownList4_TableTypeSelectedIndexChanged(object
sender, EventArgs e)
{
DetailsView dv = (DetailsView)sender;

DropDownList DL2 = dv.FindControl("DropDownList2") as DropDownList;
DropDownList DL4 = dv.FindControl("DropDownList4") as DropDownList;

if (DL4.Text.ToString() == "Mailboxes")
{
DL2.DataSourceID = "AccessDataSource2";
DL2.DataTextField = "BoxNumber";
DL2.DataValueField = "Boxnumber";
dv.DataBind();
}
else
{
DL2.DataSourceID = "AccessDataSource3";
DL2.DataTextField = "AttendantID";
DL2.DataValueField = "AttendantID";
dv.DataBind();
}
}

</script>

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1"
Runat="Server">
<br />
<span style="color: navy; font-family: Verdana"><strong>Mailboxes for
Web Account </strong></span>
<asp:Label ID="Label1" runat="server" Text='<%#
Request.QueryString["User"] %>' Font-Names="Verdana" Font-Size="12pt"
Font-Bold="True" ForeColor="Navy"></asp:Label><br />
<br />
<asp:Menu ID="Menu2" runat="server" BackColor="#FFC080" BorderColor="Navy"
BorderStyle="Inset" BorderWidth="1px" Font-Bold="False"
Font-Strikeout="False"

Click to expand...

Steven Cheng · Jan 15, 2009

Hi Morris,

As for the new exception you encountered:

===================

Exception Details: System.InvalidOperationException: Databinding methods
such as Eval(), XPath(), and Bind() can only be used in the context of a
databound control.
==================

it is due to the <%# Bind %> like databinding expression is only supported
when you perform databinding on the DetailsView control. However, when you
call dropdownlist.DataBind method(as you do it in Dropdownlist4's
SelectedIndexChanged event), the <%# Bind %> expression is out of
DetailsView's databinding context(not data is available for bind to it) and
thus the exception got raised.

after some research, I've found a very good web article mentioned this
issue and provide some good examples on how to resolve this
problem(actually the sample is exactly focus on how to implement such kind
of cascading Dropdownlist association ):

#Demo for 2-way databinding cascading lists within a FormView
http://www.webswapp.com/codesamples/aspnet20/dependentlists/default.aspx

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead

Delighting our customers is our #1 priority. We welcome your comments and
suggestions about how we can improve the support we provide to you. Please
feel free to let my manager know what you think of the level of service
provided. You can send feedback directly to my manager at:
(e-mail address removed).

--------------------

From: =?Utf-8?B?TW9ycmlzIE5ldW1hbg==?= <[email protected]>
References: <[email protected]>

Morris Neuman · Jan 16, 2009

Thanks, I tried the demo per the link and find that my code keeps looping in
the ddl2TypeID_DataBound script. This is invoked by the DropDownList2
OnDataBound method per the demo.

My code is as follows:

<%@ Page Language="C#" MasterPageFile="~/MasterPage1.master"
Title="Admin-Manage Web Account-Mailboxes" %>
<%@ Import Namespace="System.Web.UI.WebControls" %>

<script runat="server">

protected void Page_Load(object sender, EventArgs e)
{
Label1.DataBind();
}

protected void LinkButton1_Click(object sender, EventArgs e)
{
DetailsView1.Visible = true;
}

protected void DetailsView1_ItemInserted(object sender,
DetailsViewInsertedEventArgs e)
{
GridView1.DataBind();
}
protected void ddl2TypeID_DataBound(object sender, EventArgs e)
{
//DropDownList ddl2 = (DropDownList)sender;
//DropDownList ddl4 = (DropDownList)sender;

DropDownList DL2 = DetailsView1.FindControl("DropDownList2") as
DropDownList;
DropDownList DL4 = DetailsView1.FindControl("DropDownList4") as
DropDownList;

string DL4_Value = DL4.SelectedValue;

DL4_Value = "Mailboxes";

if (DL4_Value == "Mailboxes")
{
DL2.DataSourceID = "AccessDataSource2";
DL2.DataTextField = "BoxNumber";
DL2.DataValueField = "Boxnumber";
//DL2.DataBind();
//dv.DataBind();
}
else
{
DL2.DataSourceID = "AccessDataSource3";
DL2.DataTextField = "AttendantID";
DL2.DataValueField = "AttendantID";
//DL2.DataBind();
//dv.DataBind();
}

if (DL2 != null)
{
DL2.DataBind();
}

Page.Error += new EventHandler(Page_Error);
}

void Page_Error(object sender, EventArgs e)
{
Response.Write("Error" + e.ToString());
}

</script>

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1"
Runat="Server">
<br />
<span style="color: navy; font-family: Verdana"><strong>Table Types for
Web Account </strong></span>
<asp:Label ID="Label1" runat="server" Text='<%#
Request.QueryString["User"] %>' Font-Names="Verdana" Font-Size="12pt"
Font-Bold="True" ForeColor="Navy"></asp:Label><br />
<br />

<asp:LinkButton ID="LinkButton1" runat="server"
OnClick="LinkButton1_Click" Font-Names="verdana" Font-Size="8pt"
BackColor="Lavender" BorderColor="SlateGray" BorderStyle="Inset"
BorderWidth="1px" ForeColor="DarkSlateGray">Add Table
Types</asp:LinkButton><br />
<br />
<asp

etailsView ID="DetailsView1" runat="server"
AutoGenerateInsertButton="True"
AutoGenerateRows="False" DataSourceID="AccessDataSource1"
DefaultMode="Insert" Visible="False" Width="276px"
Font-Names="Verdana"
Font-Size="8pt"
BorderStyle="Solid" BorderWidth="1px" ForeColor="Navy"
BorderColor="#FFC080" ToolTip="Correct Table Type Selected?"
DataKeyNames="WebAccountName,WebAccountID">
<Fields>
<asp:BoundField DataField="WebAccountID"
HeaderText="WebAccountID"
InsertVisible="False" SortExpression="WebAccountID" />
<asp:BoundField DataField="WebAccountName"
HeaderText="WebAccountName" InsertVisible="False"
SortExpression="WebAccountName" />
<asp:TemplateField HeaderText="TableType & ID"
SortExpression="TableType">
<InsertItemTemplate>
<table style="width: 100%">
<tr>
<td style="width: 76px">
<asp:Label ID="Label5" runat="server"
style="text-align: left"
Text="Select Table Name"></asp:Label>
</td>
<td style="width: 131px">
<asp

ropDownList ID="DropDownList4"
runat="server" AutoPostBack="True"
DataSourceID="AccessDataSource4"
DataTextField="WTableType"
DataValueField="WTableType"
SelectedValue='<%# Bind("TableType") %>'
Width="122px" >
<asp:ListItem Selected
="True">Mailboxes</asp:ListItem>
</asp

ropDownList>
</td>
<td>
<asp:Label ID="Label4" runat="server"
style="text-align: left"
Text=" then select Record ID">
</asp:Label>
</td>
<td>
<asp

ropDownList ID="DropDownList2"
runat="server"
DataSourceID="AccessDataSource2"
DataTextField="BoxNumber"
DataValueField="BoxNumber"
OnDataBound="ddl2TypeID_DataBound"
SelectedValue='<%# Bind("TypeID") %>'
Width="110px">
</asp

ropDownList>
</td>
</tr>
</table>

<asp:AccessDataSource ID="AccessDataSource2"
runat="server"
DataFile="C:\Program
Files\CallMaster\Data\Callmaster.mdb"
SelectCommand="SELECT BoxNumber FROM Mailboxes ORDER
BY BoxNumber">
</asp:AccessDataSource>
<asp:SqlDataSource ID="SqlDataSource2" runat="server"
ConnectionString="<%$
ConnectionStrings:CallMasterSQLConnectionString %>"
SelectCommand="SELECT [BoxNumber] FROM [Mailboxes]
ORDER BY [BoxNumber]">
</asp:SqlDataSource>
<asp:AccessDataSource ID="AccessDataSource3"
runat="server"
DataFile="C:\Program
Files\CallMaster\Data\Callmaster.mdb"
SelectCommand="SELECT AttendantID FROM Attendant
GROUP BY AttendantID ORDER BY AttendantID">
</asp:AccessDataSource>
<asp:SqlDataSource ID="SqlDataSource3" runat="server"
ConnectionString="<%$
ConnectionStrings:CallMasterSQLConnectionString %>"
SelectCommand="SELECT AttendantID FROM Attendant
GROUP BY AttendantID ORDER BY AttendantID">
</asp:SqlDataSource>
<asp:AccessDataSource ID="AccessDataSource4"
runat="server"
DataFile="C:\Program
Files\CallMaster\Data\Callmaster.mdb"
SelectCommand="SELECT WTableType FROM
WebAccountTableType ORDER BY WTableType">
</asp:AccessDataSource>
<asp:SqlDataSource ID="SqlDataSource4" runat="server"
ConnectionString="<%$
ConnectionStrings:CallMasterSQLConnectionString %>"
SelectCommand="SELECT TableType FROM
WebAccountTableType ORDER BY TableType">
</asp:SqlDataSource>
</InsertItemTemplate>
<ItemTemplate>
<asp:Label ID="Label2" runat="server" Text='<%#
Bind("TableType") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:CommandField InsertVisible="False" ShowInsertButton="True" >
<ControlStyle Font-Names="Verdana" />
</asp:CommandField>
</Fields>
<CommandRowStyle BackColor="Lavender" BorderColor="SlateGray"
BorderStyle="Inset"
BorderWidth="2px" ForeColor="DarkSlateGray" />
<HeaderStyle BackColor="#FFC080" BorderColor="#FFC080" />
<FieldHeaderStyle BackColor="#FFC080" />
<InsertRowStyle Width="100px" />
</asp

etailsView>
<br />
<asp:AccessDataSource ID="AccessDataSource1" runat="server"
DataFile="<%$ ConnectionStrings:CALLMasterMDB %>"
SelectCommand="SELECT [WebAccountID], [WebAccountName], [TableType],
[TypeID] FROM [WebAccount] WHERE ([WebAccountName] = ?) ORDER BY
[WebAccountName], [TableType], [TypeID]"
DeleteCommand="DELETE FROM [WebAccount] WHERE [WebAccountID] = ?"
InsertCommand="INSERT INTO [WebAccount] ([WebAccountName], [TypeID],
[TableType]) VALUES (?, ?, ?)"
UpdateCommand="UPDATE WebAccount SET TypeID = ?, TableType = ? WHERE
(WebAccountID = ?)">
<SelectParameters>
<asp:QueryStringParameter Name="WebAccountName"
QueryStringField="User"
Type="String" />
</SelectParameters>
<DeleteParameters>
<asp

arameter Name="WebAccountID" Type="Int32" />
</DeleteParameters>
<UpdateParameters>
<asp

arameter Name="TypeID" Type="String" />
<asp

arameter Name="TableType" Type="String" />
<asp

arameter Name="WebAccountID" Type="Int32" />
</UpdateParameters>
<InsertParameters>
<asp:QueryStringParameter Name="WebAccountName"
QueryStringField="User"
Type="String" />
<asp

arameter Name="TypeID" Type="String" />
<asp

arameter Name="TableType" />
</InsertParameters>
</asp:AccessDataSource>

<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:CallMasterSQLConnectionString %>"
DeleteCommand="DELETE FROM [WebAccount] WHERE [WebAccountID] =
@WebAccountID" InsertCommand="INSERT INTO [WebAccount] ([WebAccountName],
[TypeID], [TableType]) VALUES (@WebAccountName, @TypeID, @TableType)"
SelectCommand="SELECT [WebAccountID], [WebAccountName], [TableType],
[TypeID] FROM [WebAccount] WHERE ([WebAccountName] = @WebAccountName) ORDER
BY [WebAccountName], [TableType], [TypeID]"
UpdateCommand="UPDATE WebAccount SET TypeID = @TypeID, TableType =
@TableType WHERE (WebAccountID = @WebAccountID)">
<DeleteParameters>
<asp

arameter Name="WebAccountID" Type="Int32" />
</DeleteParameters>
<UpdateParameters>
<asp

arameter Name="TypeID" Type="String" />
<asp

arameter Name="WebAccountID" Type="Int32" />
<asp

arameter Name="TableType" />
</UpdateParameters>
<SelectParameters>
<asp:QueryStringParameter Name="WebAccountName"
QueryStringField="User"
Type="String" />
</SelectParameters>
<InsertParameters>
<asp:QueryStringParameter Name="WebAccountName"
QueryStringField="User"
Type="String" />
<asp

arameter Name="TypeID" Type="String" />
<asp

arameter Name="TableType" />
</InsertParameters>
</asp:SqlDataSource>
<br />
</asp:Content>

Hopefully you can tell me what I am doing wrong in invoking this method.

Steven Cheng · Jan 19, 2009

Hi Morris,

Based on the code you provided, the "infinite loop in your databind method"
is cause by "you call DataBind method on Dropdownlist inside dropdownlist's
own databound" event. This cause the databinding opeation happend
recursivelyl(endless).

This is the "DataBound" event handler in which you invoke dropdownlist's
DataBind method.
===========
protected void ddl2TypeID_DataBound(object sender, EventArgs e)
{
==================

According to the article I gave you in previous message, you should
manually use a for loop to add items into dropdownlist instead of using
Databind. You can still use DataSource control, but not directly bind them
to dropdownlist. You can manually call DatasourceControl.Select method to
get the resultset and loop through the resultset and Add items into
dropdownlist.

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead

Delighting our customers is our #1 priority. We welcome your comments and
suggestions about how we can improve the support we provide to you. Please
feel free to let my manager know what you think of the level of service
provided. You can send feedback directly to my manager at:
(e-mail address removed).

==================================================
Get notification to my posts through email? Please refer to
http://msdn.microsoft.com/en-us/subscriptions/aa948868.aspx#notifications.

--------------------

Morris Neuman · Jan 19, 2009

Hi,

I removed the Bind (SelectedValue='<%# Bind("TypeID") %>') in the
DropDownList2
<asp

ropDownList ID="DropDownList2" runat="server"
DataSourceID="AccessDataSource2"
DataTextField="BoxNumber"
DataValueField="BoxNumber"
OnDataBound="ddl2TypeID_DataBound"
Width="110px">
</asp

ropDownList>

DropDownList4 is defined as follows:
<asp

ropDownList ID="DropDownList4" runat="server" AutoPostBack="True"
DataSourceID="AccessDataSource4"
DataTextField="WTableType"
DataValueField="WTableType" SelectedValue='<%#
Bind("TableType") %>'
Width="122px" >
<asp:ListItem Selected ="True">Mailboxes</asp:ListItem>
</asp

ropDownList>

My DetailsView1 is bound to a datasource and contains the 2 DropDownLists as
Insert Templates.

In the script ddl2TypeID_DataBound, I have the following:

protected void ddl2TypeID_DataBound(object sender, EventArgs e)
{
DropDownList DL2 = DetailsView1.FindControl("DropDownList2") as
DropDownList;
DropDownList DL4 = DetailsView1.FindControl("DropDownList4") as
DropDownList;

string DL4_Value = DL4.SelectedValue;

if (DL4_Value == "Mailboxes")
{
DL2.DataSourceID = "AccessDataSource2";
DL2.DataTextField = "BoxNumber";
DL2.DataValueField = "Boxnumber";
}
else
{
DL2.DataSourceID = "AccessDataSource3";
DL2.DataTextField = "AttendantID";
DL2.DataValueField = "AttendantID";
}

if (DL2 != null)
{
DL2.DataBind();
}

Page.Error += new EventHandler(Page_Error);
}

void Page_Error(object sender, EventArgs e)
{
Response.Write("Error" + e.ToString());
}

Even if I comment out the DL2.DataBind(); statement in the script, it
continues to loop. Sorry I am new at this and learning so things seem a bit
difficult. I would appreciate if you can show by changing my code sample
what I should do.

Steven Cheng · Jan 22, 2009

Hi Morris,

I think there might still exists some code logic that cause an recursive
method call. Would you try send me the test page for me to perform some
local test? Also, I suggest you try best to simplify it, remove all other
unrelated elemetns(such as format, style, other controls). And for
database, I suggest you use a simple table so that I can easily create a
mock table for test.

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead

Delighting our customers is our #1 priority. We welcome your comments and
suggestions about how we can improve the support we provide to you. Please
feel free to let my manager know what you think of the level of service
provided. You can send feedback directly to my manager at:
(e-mail address removed).

--------------------

Morris Neuman · Jan 23, 2009

Hi Steven,

I have uploaded the project and the database to our FTP site. You can
download it at
www.speechsoft.com/guestupload/CMWebManagerDemo-StevenCheng.zip.

I have removed all the formating and tried to make the pages simple. As you
can see from the project, there are 2 dropdownlists (DDL4 and DDL2). I need
to bind DDL2 to either datasource2 or datasource3 based on the selected value
of DDL4.

Hopefully you you will be able to see the problem and provide a solution.

Allen Chen [MSFT] · Jan 23, 2009

Hi Morris,

Steven asked for sick leave today. I'll follow up this case.

I've tested your code and think you can try following steps to achieve your
requirement.

1. Remove DataSourceID="SqlDataSource2" from DropDownList2.
2. Remove OnDataBound="ddl2TypeID_DataBound" from DropDownList2 or else
there'll be a infinite loop.
3. Remove SelectedValue='<%# Eval("TypeID") %>' from DropDownList2. I don't
know what's the effect you need by doing this. Could you clarify it?
4. Add the SelectedIndexChanged event handler for DropDownList4 and rebind
the DropDownList 2 in this event handler.

Here's the edited code for Default.aspx.

<%@ Page Language="C#" MasterPageFile="~/MasterPage1.master"
Title="Admin-Manage Web Account-Mailboxes" %>
<%@ Import Namespace="System.Web.UI.WebControls" %>

<script runat="server">

protected void Page_Load(object sender, EventArgs e)
{
Label1.DataBind();
}

protected void DetailsView1_ItemInserted(object sender,
DetailsViewInsertedEventArgs e)
{
}

void Page_Error(object sender, EventArgs e)
{
Response.Write("Error" + e.ToString());
}

protected void SqlDataSource1_Selected(object sender,
SqlDataSourceStatusEventArgs e)
{

}

protected void DetailsView1_DataBound(object sender, EventArgs e)
{
BindDDL2();
}
void BindDDL2() {
DropDownList DL2 = DetailsView1.FindControl("DropDownList2") as
DropDownList;
DropDownList DL4 = DetailsView1.FindControl("DropDownList4") as
DropDownList;
SqlDataSource sds2 = DetailsView1.FindControl("SqlDataSource2") as
SqlDataSource;
SqlDataSource sds3 = DetailsView1.FindControl("SqlDataSource3") as
SqlDataSource;
string DL4_Value = DL4.SelectedValue;

if (DL4_Value == "Mailboxes")
{
DL2.DataSource = sds2;
DL2.DataTextField = "BoxNumber";
DL2.DataValueField = "Boxnumber";
}
else
{
DL2.DataSource = sds3;
DL2.DataTextField = "AttendantID";
DL2.DataValueField = "AttendantID";
}

if (DL2 != null)
{
DL2.DataBind();
}

Page.Error += new EventHandler(Page_Error);
}

protected void DropDownList4_SelectedIndexChanged(object sender,
EventArgs e)
{
BindDDL2();
}
</script>

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1"
Runat="Server">
<br />

<span style="color: navy; font-family: Verdana"><strong>Table Types for
Web Account </strong></span>
<asp:Label ID="Label1" runat="server" Text="cmadmin"
Font-Names="Verdana" Font-Size="12pt" Font-Bold="True"
ForeColor="Navy"></asp:Label><br />
<br />

<br />
<asp

etailsView ID="DetailsView1" runat="server"
AutoGenerateInsertButton="True"
AutoGenerateRows="False" DataSourceID="SqlDataSource1"
DefaultMode="Insert"
DataKeyNames="WebAccountName,WebAccountID"
ondatabound="DetailsView1_DataBound">
<Fields>
<asp:BoundField DataField="WebAccountID"
HeaderText="WebAccountID"
InsertVisible="False" SortExpression="WebAccountID" />
<asp:BoundField DataField="WebAccountName"
HeaderText="WebAccountName" InsertVisible="False"
SortExpression="WebAccountName" />
<asp:TemplateField HeaderText="TableType & ID"
SortExpression="TableType">
<InsertItemTemplate>
<table >
<tr>
<td >
<asp:Label ID="Label5" runat="server"
Text="Select Table Name"></asp:Label>
</td>
<td >
<asp

ropDownList
OnSelectedIndexChanged="DropDownList4_SelectedIndexChanged"
ID="DropDownList4" runat="server" AutoPostBack="True"
DataSourceID="SqlDataSource4"
DataTextField="WTableType"
DataValueField="WTableType"
SelectedValue='<%# Bind("TableType") %>'>
<asp:ListItem Selected
="True">Mailboxes</asp:ListItem>
</asp

ropDownList>
</td>
<td>
<asp:Label ID="Label4" runat="server"
style="text-align: left"
Text=" then select Record ID">
</asp:Label>
</td>
<td>
<asp

ropDownList ID="DropDownList2"
runat="server"
DataTextField="BoxNumber"
DataValueField="BoxNumber"</asp

ropDownList>
</td>
</tr>
</table>
 

<asp:SqlDataSource ID="SqlDataSource2" runat="server"
ConnectionString="<%$
ConnectionStrings:CallMasterSQLConnectionString %>"
SelectCommand="SELECT [BoxNumber] FROM [Mailboxes]
ORDER BY [BoxNumber]">
</asp:SqlDataSource>

<asp:SqlDataSource ID="SqlDataSource3" runat="server"
ConnectionString="<%$
ConnectionStrings:CallMasterSQLConnectionString %>"
SelectCommand="SELECT AttendantID FROM Attendant
GROUP BY AttendantID ORDER BY AttendantID">
</asp:SqlDataSource>

<asp:SqlDataSource ID="SqlDataSource4" runat="server"
ConnectionString="<%$
ConnectionStrings:CallMasterSQLConnectionString %>"
SelectCommand="SELECT WTableType FROM
WebAccountTableType ORDER BY WTableType Desc"</asp:SqlDataSource>
</InsertItemTemplate>
<ItemTemplate>
<asp:Label ID="Label2" runat="server" Text='<%#
Bind("TableType") %>'></asp:Label>
</ItemTemplate>
<ControlStyle Font-Names="Verdana" />
</asp:CommandField>
</Fields>

</asp

etailsView>
<br />

<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:CallMasterSQLConnectionString %>"

DeleteCommand="DELETE FROM [WebAccount] WHERE [WebAccountID] =
@WebAccountID" InsertCommand="INSERT INTO [WebAccount] ([WebAccountName],
[TypeID], [TableType]) VALUES (@WebAccountName, @TypeID, @TableType)"
SelectCommand="SELECT [WebAccountID], [WebAccountName],
[TableType], [TypeID] FROM [WebAccount] WHERE ([WebAccountName] =
@WebAccountName) ORDER BY [WebAccountName], [TableType], [TypeID]"

UpdateCommand="UPDATE WebAccount SET TypeID = @TypeID, TableType =
@TableType WHERE (WebAccountID = @WebAccountID)"<DeleteParameters>
<asp

arameter Name="WebAccountID" Type="Int32" />
</DeleteParameters>
<UpdateParameters>
<asp

arameter Name="TypeID" Type="String" />
<asp

arameter Name="WebAccountID" Type="Int32" />
<asp

arameter Name="TableType" />
</UpdateParameters>
<SelectParameters>
<asp:QueryStringParameter Name="WebAccountName"
QueryStringField="User"
Type="String" />
</SelectParameters>
<InsertParameters>
<asp:ControlParameter ControlID="Label1" Name="WebAccountName"
PropertyName="Text" Type="String" />
<asp

arameter Name="TypeID" Type="String" />
<asp

arameter Name="TableType" />
</InsertParameters>
</asp:SqlDataSource>

<br />
<br />
   

            &nbs
p;            &n
bsp;            
            &nbs
p;            &n
bsp;            
   
<br />
<br />
</asp:Content>

Please let me know if above code is what you need and feel free to ask if
you need additional assistance.

Regards,
Allen Chen
Microsoft Online Support

Morris Neuman · Jan 27, 2009

Hi Allen,

Thanks for the info. For the most part it worked (i.e. when I selected the
value of DDL4, DDL2 bound to the correct datasource).

1) However, when I inserted the DetailsView1 record the value selected in
DDL2 did not get added to the record as it should be bound to TypeID field
per DetailsView1 DataSourceID1. This is what I was attempting per the
SelectedValue='<%# Bind("TypeID") %>' from DropDownList2. How do I do that?

2) Per your code, you initiate DetailsView1_DataBound where you call
BindDDL2(); and you also initiate DropDownList4_SelectedIndexChanged where
you call BindDDL2(); What event triggers the DetailsView_DataBound?

3) You have a blank script SqlDataSource1_Selected? Is that required?

Once issue 1 above is addressed then this should work as desired.

Look forward to your response.
--
Thanks
Morris

Allen Chen said:
Hi Morris,

Steven asked for sick leave today. I'll follow up this case.

I've tested your code and think you can try following steps to achieve your
requirement.

1. Remove DataSourceID="SqlDataSource2" from DropDownList2.
2. Remove OnDataBound="ddl2TypeID_DataBound" from DropDownList2 or else
there'll be a infinite loop.
3. Remove SelectedValue='<%# Eval("TypeID") %>' from DropDownList2. I don't
know what's the effect you need by doing this. Could you clarify it?
4. Add the SelectedIndexChanged event handler for DropDownList4 and rebind
the DropDownList 2 in this event handler.

Here's the edited code for Default.aspx.

<%@ Page Language="C#" MasterPageFile="~/MasterPage1.master"
Title="Admin-Manage Web Account-Mailboxes" %>
<%@ Import Namespace="System.Web.UI.WebControls" %>

<script runat="server">

protected void Page_Load(object sender, EventArgs e)
{
Label1.DataBind();
}

protected void DetailsView1_ItemInserted(object sender,
DetailsViewInsertedEventArgs e)
{
}

void Page_Error(object sender, EventArgs e)
{
Response.Write("Error" + e.ToString());
}

protected void SqlDataSource1_Selected(object sender,
SqlDataSourceStatusEventArgs e)
{

}

protected void DetailsView1_DataBound(object sender, EventArgs e)
{
BindDDL2();
}
void BindDDL2() {
DropDownList DL2 = DetailsView1.FindControl("DropDownList2") as
DropDownList;
DropDownList DL4 = DetailsView1.FindControl("DropDownList4") as
DropDownList;
SqlDataSource sds2 = DetailsView1.FindControl("SqlDataSource2") as
SqlDataSource;
SqlDataSource sds3 = DetailsView1.FindControl("SqlDataSource3") as
SqlDataSource;
string DL4_Value = DL4.SelectedValue;

if (DL4_Value == "Mailboxes")
{
DL2.DataSource = sds2;
DL2.DataTextField = "BoxNumber";
DL2.DataValueField = "Boxnumber";
}
else
{
DL2.DataSource = sds3;
DL2.DataTextField = "AttendantID";
DL2.DataValueField = "AttendantID";
}

if (DL2 != null)
{
DL2.DataBind();
}

Page.Error += new EventHandler(Page_Error);
}

protected void DropDownList4_SelectedIndexChanged(object sender,
EventArgs e)
{
BindDDL2();
}
</script>

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1"
Runat="Server">
<br />

<span style="color: navy; font-family: Verdana"><strong>Table Types for
Web Account </strong></span>
<asp:Label ID="Label1" runat="server" Text="cmadmin"
Font-Names="Verdana" Font-Size="12pt" Font-Bold="True"
ForeColor="Navy"></asp:Label><br />
<br />

<br />
<aspetailsView ID="DetailsView1" runat="server"
AutoGenerateInsertButton="True"
AutoGenerateRows="False" DataSourceID="SqlDataSource1"
DefaultMode="Insert"
DataKeyNames="WebAccountName,WebAccountID"
ondatabound="DetailsView1_DataBound">
<Fields>
<asp:BoundField DataField="WebAccountID"
HeaderText="WebAccountID"
InsertVisible="False" SortExpression="WebAccountID" />
<asp:BoundField DataField="WebAccountName"
HeaderText="WebAccountName" InsertVisible="False"
SortExpression="WebAccountName" />
<asp:TemplateField HeaderText="TableType & ID"
SortExpression="TableType">
<InsertItemTemplate>
<table >
<tr>
<td >
<asp:Label ID="Label5" runat="server"
Text="Select Table Name"></asp:Label>
</td>
<td >
<aspropDownList
OnSelectedIndexChanged="DropDownList4_SelectedIndexChanged"
ID="DropDownList4" runat="server" AutoPostBack="True"
DataSourceID="SqlDataSource4"
DataTextField="WTableType"
DataValueField="WTableType"
SelectedValue='<%# Bind("TableType") %>'>
<asp:ListItem Selected
="True">Mailboxes</asp:ListItem>
</aspropDownList>
</td>
<td>
<asp:Label ID="Label4" runat="server"
style="text-align: left"
Text=" then select Record ID">
</asp:Label>
</td>
<td>
<aspropDownList ID="DropDownList2"
runat="server"
DataTextField="BoxNumber"
DataValueField="BoxNumber"</aspropDownList>
</td>
</tr>
</table>

<asp:SqlDataSource ID="SqlDataSource2" runat="server"
ConnectionString="<%$
ConnectionStrings:CallMasterSQLConnectionString %>"
SelectCommand="SELECT [BoxNumber] FROM [Mailboxes]
ORDER BY [BoxNumber]">
</asp:SqlDataSource>

<asp:SqlDataSource ID="SqlDataSource3" runat="server"
ConnectionString="<%$
ConnectionStrings:CallMasterSQLConnectionString %>"
SelectCommand="SELECT AttendantID FROM Attendant
GROUP BY AttendantID ORDER BY AttendantID">
</asp:SqlDataSource>

<asp:SqlDataSource ID="SqlDataSource4" runat="server"
ConnectionString="<%$
ConnectionStrings:CallMasterSQLConnectionString %>"
SelectCommand="SELECT WTableType FROM
WebAccountTableType ORDER BY WTableType Desc"</asp:SqlDataSource>
</InsertItemTemplate>
<ItemTemplate>
<asp:Label ID="Label2" runat="server" Text='<%#
Bind("TableType") %>'></asp:Label>
</ItemTemplate>
<ControlStyle Font-Names="Verdana" />
</asp:CommandField>
</Fields>

</aspetailsView>
<br />

<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:CallMasterSQLConnectionString %>"

DeleteCommand="DELETE FROM [WebAccount] WHERE [WebAccountID] =
@WebAccountID" InsertCommand="INSERT INTO [WebAccount] ([WebAccountName],
[TypeID], [TableType]) VALUES (@WebAccountName, @TypeID, @TableType)"
SelectCommand="SELECT [WebAccountID], [WebAccountName],
[TableType], [TypeID] FROM [WebAccount] WHERE ([WebAccountName] =
@WebAccountName) ORDER BY [WebAccountName], [TableType], [TypeID]"

UpdateCommand="UPDATE WebAccount SET TypeID = @TypeID, TableType =
@TableType WHERE (WebAccountID = @WebAccountID)"<DeleteParameters>
<asparameter Name="WebAccountID" Type="Int32" />
</DeleteParameters>
<UpdateParameters>
<asparameter Name="TypeID" Type="String" />
<asparameter Name="WebAccountID" Type="Int32" />
<asparameter Name="TableType" />
</UpdateParameters>
<SelectParameters>
<asp:QueryStringParameter Name="WebAccountName"
QueryStringField="User"
Type="String" />
</SelectParameters>
<InsertParameters>
<asp:ControlParameter ControlID="Label1" Name="WebAccountName"
PropertyName="Text" Type="String" />
<asparameter Name="TypeID" Type="String" />
<asparameter Name="TableType" />
</InsertParameters>
</asp:SqlDataSource>

<br />
<br />

&nbs
p; &n
bsp;
&nbs
p; &n
bsp;

<br />
<br />
</asp:Content>

Please let me know if above code is what you need and feel free to ask if
you need additional assistance.

Regards,
Allen Chen
Microsoft Online Support

Steven Cheng · Jan 28, 2009

Hi Morris,

Sorry for the delay due to my sick leave in the previous days. I've
performed some tests on the web project you provided. Here are some of my
findings:

1. In the "default.aspx", to simplify testing, I change the masterpage to
my own empty masterpage(to avoid additional error). And then, change some
DataSource controls' ID since some of them still refer to
AccessDataSource....

2. As we discussed earlier, the "infinite loop" problem is due to calling
"databind" method inside dropdownlist's own "DataBound" event. Therefore, I
removed the "DataBind" code logic inside "ddl2TypeID_DataBound" event. And
I use a custom function to populate the Dropdownlist2(instead of using
databinding), you can check the "Bind_SubDropDown" function I used in the
modified page. Also, the advantage of using this means is that you can
still utilize the two-way databinding expression (<% Bind() %>) on the
dropdownlist.

Here is the complete version of the modified page. I'll also email you the
page so that you can test it on your side.

=================modified default.aspx===================================
<%@ Page Language="C#" MasterPageFile="~/site.master" Title="Admin-Manage
Web Account-Mailboxes" %>
<%@ Import Namespace="System.Web.UI.WebControls" %>

<script runat="server">

protected void Page_Load(object sender, EventArgs e)
{
Label1.DataBind();
}

protected void DetailsView1_ItemInserted(object sender,
DetailsViewInsertedEventArgs e)
{
}

protected void ddl2TypeID_DataBound(object sender, EventArgs e)
{
Bind_SubDropDown();

Page.Error += new EventHandler(Page_Error);
}

void Bind_SubDropDown()
{
DropDownList DL2 = DetailsView1.FindControl("DropDownList2") as
DropDownList;
DropDownList DL4 = DetailsView1.FindControl("DropDownList4") as
DropDownList;

SqlDataSource DS2 = DetailsView1.FindControl("SqlDataSource2") as
SqlDataSource;
SqlDataSource DS3 = DetailsView1.FindControl("SqlDataSource3") as
SqlDataSource;

string DL4_Value = DL4.SelectedValue;

DL2.Items.Clear();
if (DL4_Value == "Mailboxes")
{

System.Data.DataView rs2 =
(System.Data.DataView)DS2.Select(DataSourceSelectArguments.Empty);

foreach (System.Data.DataRowView r in rs2)
{
DL2.Items.Add(new ListItem(r["BoxNumber"].ToString(),
r["Boxnumber"].ToString()));
}

}
else
{

System.Data.DataView rs3 =
(System.Data.DataView)DS3.Select(DataSourceSelectArguments.Empty);

foreach (System.Data.DataRowView r in rs3)
{
DL2.Items.Add(new ListItem(r["AttendantID"].ToString(),
r["AttendantID"].ToString()));
}
}
}

void Page_Error(object sender, EventArgs e)
{
Response.Write("Error" + e.ToString());
}

protected void Button1_Click(object sender, EventArgs e)
{

}

protected void DropDownList4_SelectedIndexChanged(object sender,
EventArgs e)
{
Bind_SubDropDown();
}
</script>

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1"
Runat="Server">
<br />
<span style="color: navy; font-family: Verdana"><strong>Table Types for
Web Account </strong></span>
<hr />
<asp:Label ID="Label1" runat="server" Text="cmadmin"
Font-Names="Verdana" Font-Size="12pt" Font-Bold="True"
ForeColor="Black"></asp:Label><br />
<br />

<br />
<asp

etailsView ID="DetailsView1" runat="server"
AutoGenerateInsertButton="True"
AutoGenerateRows="False" DataSourceID="SqlDataSource1"
DefaultMode="Insert"
DataKeyNames="WebAccountName,WebAccountID">
<Fields>
<asp:BoundField DataField="WebAccountID"
HeaderText="WebAccountID"
InsertVisible="False" SortExpression="WebAccountID" />
<asp:BoundField DataField="WebAccountName"
HeaderText="WebAccountName" InsertVisible="False"
SortExpression="WebAccountName" />
<asp:TemplateField HeaderText="TableType & ID"
SortExpression="TableType">
<InsertItemTemplate>
<table >
<tr>
<td >
<asp:Label ID="Label5" runat="server"
Text="Select Table Name"></asp:Label>
</td>
<td >
<asp

ropDownList ID="DropDownList4"
runat="server" AutoPostBack="True"
DataSourceID="SqlDataSource4"
DataTextField="WTableType"
DataValueField="WTableType"
SelectedValue='<%# Bind("TableType") %>'
OnDataBound="ddl2TypeID_DataBound"
onselectedindexchanged="DropDownList4_SelectedIndexChanged"<asp:ListItem Selected
="True">Mailboxes</asp:ListItem>
</asp

ropDownList>
</td>
<td>
<asp:Label ID="Label4" runat="server"
style="text-align: left"
Text=" then select Record ID">
</asp:Label>
</td>
<td>
<asp

ropDownList ID="DropDownList2"
runat="server"

SelectedValue='<%# Bind("TypeID") %>'>
</asp

ropDownList>
</td>
</tr>
</table>
 

<asp:SqlDataSource ID="SqlDataSource2" runat="server"
ConnectionString="<%$
ConnectionStrings:CallMasterSQLConnectionString %>"
SelectCommand="SELECT [BoxNumber] FROM [Mailboxes]
ORDER BY [BoxNumber]">
</asp:SqlDataSource>

<asp:SqlDataSource ID="SqlDataSource3" runat="server"
ConnectionString="<%$
ConnectionStrings:CallMasterSQLConnectionString %>"
SelectCommand="SELECT AttendantID FROM Attendant
GROUP BY AttendantID ORDER BY AttendantID">
</asp:SqlDataSource>

<asp:SqlDataSource ID="SqlDataSource4" runat="server"
ConnectionString="<%$
ConnectionStrings:CallMasterSQLConnectionString %>"
SelectCommand="SELECT WTableType FROM
WebAccountTableType ORDER BY WTableType Desc">
</asp:SqlDataSource>
<br />

</InsertItemTemplate>
<ItemTemplate>
<asp:Label ID="Label2" runat="server" Text='<%#
Bind("TableType") %>'></asp:Label>
</ItemTemplate>
<ControlStyle Font-Names="Verdana" />
</asp:CommandField>
</Fields>

</asp

etailsView>
<br />
<asp:Button ID="Button1" runat="server" onclick="Button1_Click"
Text="Button" />
<br />

<hr />

<hr />

<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:CallMasterSQLConnectionString %>"
DeleteCommand="DELETE FROM [WebAccount] WHERE [WebAccountID] =
@WebAccountID"
InsertCommand="INSERT INTO [WebAccount] ([WebAccountName],
[TypeID], [TableType]) VALUES (@WebAccountName, @TypeID, @TableType)"
SelectCommand="SELECT [WebAccountID], [WebAccountName],
[TableType], [TypeID] FROM [WebAccount] WHERE ([WebAccountName] =
@WebAccountName) ORDER BY [WebAccountName], [TableType], [TypeID]"
UpdateCommand="UPDATE WebAccount SET TypeID = @TypeID, TableType =
@TableType WHERE (WebAccountID = @WebAccountID)">
<DeleteParameters>
<asp

arameter Name="WebAccountID" Type="Int32" />
</DeleteParameters>
<UpdateParameters>
<asp

arameter Name="TypeID" Type="String" />
<asp

arameter Name="WebAccountID" Type="Int32" />
<asp

arameter Name="TableType" />
</UpdateParameters>
<SelectParameters>
<asp:QueryStringParameter Name="WebAccountName"
QueryStringField="User"
Type="String" />
</SelectParameters>
<InsertParameters>
<asp:ControlParameter ControlID="Label1" DefaultValue="cmadmin"
Name="WebAccountName"
PropertyName="Text" Type="String" />
<asp

arameter Name="TypeID" Type="String" />
<asp

arameter Name="TableType" />
</InsertParameters>
</asp:SqlDataSource>

<br />
<br />
   

            &nbs
p;            &n
bsp;            
            &nbs
p;            &n
bsp;            
   
<br />
<br />
</asp:Content>
=====================================================

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead

Delighting our customers is our #1 priority. We welcome your comments and
suggestions about how we can improve the support we provide to you. Please
feel free to let my manager know what you think of the level of service
provided. You can send feedback directly to my manager at:
(e-mail address removed).

==================================================
Get notification to my posts through email? Please refer to
http://msdn.microsoft.com/en-us/subscriptions/aa948868.aspx#notifications.

--------------------

Morris Neuman · Jan 29, 2009

Thanks for the info.

Since I had the solution proposed 1/22 working except for the binding of the
dropdownlist2 value when inserting the record, I continued to develop using
this solution. I just added a detailsview1_iteminserting script to add the
selected values as the required insert parameter so the datasource could then
insert the record with these values.

This worked and I was able to select the proper value and insert the record
as required.

Thanks for your help. Hope you are feeling better.
--
Morris

"Steven Cheng" said:
Hi Morris,

Sorry for the delay due to my sick leave in the previous days. I've
performed some tests on the web project you provided. Here are some of my
findings:

1. In the "default.aspx", to simplify testing, I change the masterpage to
my own empty masterpage(to avoid additional error). And then, change some
DataSource controls' ID since some of them still refer to
AccessDataSource....

2. As we discussed earlier, the "infinite loop" problem is due to calling
"databind" method inside dropdownlist's own "DataBound" event. Therefore, I
removed the "DataBind" code logic inside "ddl2TypeID_DataBound" event. And
I use a custom function to populate the Dropdownlist2(instead of using
databinding), you can check the "Bind_SubDropDown" function I used in the
modified page. Also, the advantage of using this means is that you can
still utilize the two-way databinding expression (<% Bind() %>) on the
dropdownlist.

Here is the complete version of the modified page. I'll also email you the
page so that you can test it on your side.

=================modified default.aspx===================================
<%@ Page Language="C#" MasterPageFile="~/site.master" Title="Admin-Manage
Web Account-Mailboxes" %>
<%@ Import Namespace="System.Web.UI.WebControls" %>

<script runat="server">

protected void Page_Load(object sender, EventArgs e)
{
Label1.DataBind();
}

protected void DetailsView1_ItemInserted(object sender,
DetailsViewInsertedEventArgs e)
{
}

protected void ddl2TypeID_DataBound(object sender, EventArgs e)
{
Bind_SubDropDown();

Page.Error += new EventHandler(Page_Error);
}

void Bind_SubDropDown()
{
DropDownList DL2 = DetailsView1.FindControl("DropDownList2") as
DropDownList;
DropDownList DL4 = DetailsView1.FindControl("DropDownList4") as
DropDownList;

SqlDataSource DS2 = DetailsView1.FindControl("SqlDataSource2") as
SqlDataSource;
SqlDataSource DS3 = DetailsView1.FindControl("SqlDataSource3") as
SqlDataSource;

string DL4_Value = DL4.SelectedValue;

DL2.Items.Clear();
if (DL4_Value == "Mailboxes")
{

System.Data.DataView rs2 =
(System.Data.DataView)DS2.Select(DataSourceSelectArguments.Empty);

foreach (System.Data.DataRowView r in rs2)
{
DL2.Items.Add(new ListItem(r["BoxNumber"].ToString(),
r["Boxnumber"].ToString()));
}

}
else
{

System.Data.DataView rs3 =
(System.Data.DataView)DS3.Select(DataSourceSelectArguments.Empty);

foreach (System.Data.DataRowView r in rs3)
{
DL2.Items.Add(new ListItem(r["AttendantID"].ToString(),
r["AttendantID"].ToString()));
}
}
}

void Page_Error(object sender, EventArgs e)
{
Response.Write("Error" + e.ToString());
}

protected void Button1_Click(object sender, EventArgs e)
{

}

protected void DropDownList4_SelectedIndexChanged(object sender,
EventArgs e)
{
Bind_SubDropDown();
}
</script>

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1"
Runat="Server">
<br />
<span style="color: navy; font-family: Verdana"><strong>Table Types for
Web Account </strong></span>
<hr />
<asp:Label ID="Label1" runat="server" Text="cmadmin"
Font-Names="Verdana" Font-Size="12pt" Font-Bold="True"
ForeColor="Black"></asp:Label><br />
<br />

<br />
<aspetailsView ID="DetailsView1" runat="server"
AutoGenerateInsertButton="True"
AutoGenerateRows="False" DataSourceID="SqlDataSource1"
DefaultMode="Insert"
DataKeyNames="WebAccountName,WebAccountID">
<Fields>
<asp:BoundField DataField="WebAccountID"
HeaderText="WebAccountID"
InsertVisible="False" SortExpression="WebAccountID" />
<asp:BoundField DataField="WebAccountName"
HeaderText="WebAccountName" InsertVisible="False"
SortExpression="WebAccountName" />
<asp:TemplateField HeaderText="TableType & ID"
SortExpression="TableType">
<InsertItemTemplate>
<table >
<tr>
<td >
<asp:Label ID="Label5" runat="server"
Text="Select Table Name"></asp:Label>
</td>
<td >
<aspropDownList ID="DropDownList4"
runat="server" AutoPostBack="True"
DataSourceID="SqlDataSource4"
DataTextField="WTableType"
DataValueField="WTableType"
SelectedValue='<%# Bind("TableType") %>'
OnDataBound="ddl2TypeID_DataBound"
onselectedindexchanged="DropDownList4_SelectedIndexChanged"<asp:ListItem Selected
="True">Mailboxes</asp:ListItem>
</aspropDownList>
</td>
<td>
<asp:Label ID="Label4" runat="server"
style="text-align: left"
Text=" then select Record ID">
</asp:Label>
</td>
<td>
<aspropDownList ID="DropDownList2"
runat="server"

SelectedValue='<%# Bind("TypeID") %>'>
</aspropDownList>
</td>
</tr>
</table>

<asp:SqlDataSource ID="SqlDataSource2" runat="server"
ConnectionString="<%$
ConnectionStrings:CallMasterSQLConnectionString %>"
SelectCommand="SELECT [BoxNumber] FROM [Mailboxes]
ORDER BY [BoxNumber]">
</asp:SqlDataSource>

<asp:SqlDataSource ID="SqlDataSource3" runat="server"
ConnectionString="<%$
ConnectionStrings:CallMasterSQLConnectionString %>"
SelectCommand="SELECT AttendantID FROM Attendant
GROUP BY AttendantID ORDER BY AttendantID">
</asp:SqlDataSource>

<asp:SqlDataSource ID="SqlDataSource4" runat="server"
ConnectionString="<%$
ConnectionStrings:CallMasterSQLConnectionString %>"
SelectCommand="SELECT WTableType FROM
WebAccountTableType ORDER BY WTableType Desc">
</asp:SqlDataSource>
<br />

</InsertItemTemplate>
<ItemTemplate>
<asp:Label ID="Label2" runat="server" Text='<%#
Bind("TableType") %>'></asp:Label>
</ItemTemplate>
<ControlStyle Font-Names="Verdana" />
</asp:CommandField>
</Fields>

</aspetailsView>
<br />
<asp:Button ID="Button1" runat="server" onclick="Button1_Click"
Text="Button" />
<br />

<hr />

<hr />

<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:CallMasterSQLConnectionString %>"
DeleteCommand="DELETE FROM [WebAccount] WHERE [WebAccountID] =
@WebAccountID"
InsertCommand="INSERT INTO [WebAccount] ([WebAccountName],
[TypeID], [TableType]) VALUES (@WebAccountName, @TypeID, @TableType)"
SelectCommand="SELECT [WebAccountID], [WebAccountName],
[TableType], [TypeID] FROM [WebAccount] WHERE ([WebAccountName] =
@WebAccountName) ORDER BY [WebAccountName], [TableType], [TypeID]"
UpdateCommand="UPDATE WebAccount SET TypeID = @TypeID, TableType =
@TableType WHERE (WebAccountID = @WebAccountID)">
<DeleteParameters>
<asparameter Name="WebAccountID" Type="Int32" />
</DeleteParameters>
<UpdateParameters>
<asparameter Name="TypeID" Type="String" />
<asparameter Name="WebAccountID" Type="Int32" />
<asparameter Name="TableType" />
</UpdateParameters>
<SelectParameters>
<asp:QueryStringParameter Name="WebAccountName"
QueryStringField="User"
Type="String" />
</SelectParameters>
<InsertParameters>
<asp:ControlParameter ControlID="Label1" DefaultValue="cmadmin"
Name="WebAccountName"
PropertyName="Text" Type="String" />
<asparameter Name="TypeID" Type="String" />
<asparameter Name="TableType" />
</InsertParameters>
</asp:SqlDataSource>

<br />
<br />

&nbs
p; &n
bsp;
&nbs
p; &n
bsp;

<br />
<br />
</asp:Content>
=====================================================

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead

Delighting our customers is our #1 priority. We welcome your comments and
suggestions about how we can improve the support we provide to you. Please
feel free to let my manager know what you think of the level of service
provided. You can send feedback directly to my manager at:
(e-mail address removed).

==================================================
Get notification to my posts through email? Please refer to
http://msdn.microsoft.com/en-us/subscriptions/aa948868.aspx#notifications.

--------------------

From: =?Utf-8?B?TW9ycmlzIE5ldW1hbg==?= <[email protected]>
Subject: RE: Dropdownlist datasource dependency
Date: Mon, 26 Jan 2009 16:36:01 -0800

Click to expand...

Hi Allen,

Thanks for the info. For the most part it worked (i.e. when I selected

Click to expand...

Steven Cheng · Jan 30, 2009

Thanks for your followup Morris,

I'm glad that you've also got it working.

yes, the way you used (which manually extract the parameter values and
supply it in DetailsView_Inserting event) is another workable approach. My
solution in previous reply will keep the two-way databinding (<% Bind %>)
working. Anyway, if you have any further questions or need any help in the
future, please feel free to post here.

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead

Delighting our customers is our #1 priority. We welcome your comments and
suggestions about how we can improve the support we provide to you. Please
feel free to let my manager know what you think of the level of service
provided. You can send feedback directly to my manager at:
(e-mail address removed).

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Dropdownlist datasource dependency

Morris Neuman

Steven Cheng

Morris Neuman

Steven Cheng

Morris Neuman

Steven Cheng

Morris Neuman

Steven Cheng

Morris Neuman

Allen Chen [MSFT]

Morris Neuman

Steven Cheng

Morris Neuman

Steven Cheng

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