Why does my OnItemDataBound get fired twice?

G

Girish

Hello all,

Im wondering why my OnItemDataBound gets fired twice here. I got this sample
code from somewhere online.. and when I put a break point in the method...
it hits the method twice for each row rendered...

Any insights??

Thanks!
Girish


------------
ASPX File
-----------
<%@ Page language="c#" Inherits="MasterDetail.CustomerOrderDataGrid"
EnableViewState="False" CodeBehind="CustomerOrderDataGrid.aspx.cs"
AutoEventWireup="false" %>
<HTML>
<body style="FONT: x-small Verdana, Arial, sans-serif">
<!-- Begin Web Form -->
<form id="CustomerOrderDataGrid" method="post" runat="server">
<p><a href="/DayOfDotNet/">Parent Directory</a></p>
<!-- Begin DataGrid -->
<asp:DataGrid id="CustomerDataGrid" runat="server"
AutoGenerateColumns="False" CellPadding="2"
CellSpacing="0" Font-Names="Verdana, Arial, sans-serif"
BorderColor="Black" BorderWidth="1"
GridLines="Horizontal"
OnItemDataBound="CustomerDataGrid_OnItemDataBound" EnableViewState="False">
<AlternatingItemStyle BackColor="Tan"></AlternatingItemStyle>
<ItemStyle Font-Size="X-Small"></ItemStyle>
<HeaderStyle Font-Size="Small" Font-Names="Arial" Font-Bold="True"
ForeColor="White" BackColor="Maroon"></HeaderStyle>
<Columns>
<asp:BoundColumn Visible="False"
DataField="CustomerID"></asp:BoundColumn>
<asp:TemplateColumn HeaderText="Customer">
<ItemStyle VerticalAlign="Top"></ItemStyle>
<ItemTemplate>
<b>
<%# DataBinder.Eval(Container.DataItem, "CompanyName") %>
</b>
<br>
<%# DataBinder.Eval(Container.DataItem, "Address" ) %>
.. <br>
<%# DataBinder.Eval(Container.DataItem, "City" ) %>
,
<%# DataBinder.Eval(Container.DataItem, "Region") %>
<%# DataBinder.Eval(Container.DataItem, "PostalCode" ) %>
<br>
<br>
<%# DataBinder.Eval(Container.DataItem, "ContactName" ) %>
<br>
<%# DataBinder.Eval(Container.DataItem, "ContactTitle" ) %>
<br>
<%# DataBinder.Eval(Container.DataItem, "Phone" ) %>
</ItemTemplate>
</asp:TemplateColumn>
</Columns>
</asp:DataGrid>
<!-- End DataGrid -->
</form>
<!-- End Web Form -->
</body>
</HTML>


CODE BEHIND
-----------------
using System;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Configuration;

namespace MasterDetail
{
public class CustomerOrderDataGrid : System.Web.UI.Page
{
protected DataGrid CustomerDataGrid;
private DataSet ds = new DataSet();

private void Page_Load(object sender, System.EventArgs e)
{
string sqlStmt = "SELECT top 1 * FROM Customers; SELECT * FROM Orders";
string conString = "server=localhost;database=Northwind;uid=sa;pwd=;";

SqlDataAdapter sda = new SqlDataAdapter(sqlStmt, conString);

sda.Fill(ds);
ds.Tables[0].TableName = "Customers";
ds.Tables[1].TableName = "Orders";

CustomerDataGrid.DataSource = ds.Tables["Customers"];
CustomerDataGrid.DataBind();
}

//Use the OnItemDataBound event handler to dynamically add an embedded
DataGrid
protected void CustomerDataGrid_H(object sender, DataGridItemEventArgs e)
{
//When each row is created in the DataGrid, eval the ItemType
if(e.Item.ItemType == ListItemType.Item ||
e.Item.ItemType == ListItemType.AlternatingItem)
{
//If the ItemType is Item or AlternatingItem,
//Create a new DataGrid object named OrdersDataGrid
}
}

override protected void OnInit(EventArgs e)
{
//
// CODEGEN: This call is required by the ASP.NET Web Form Designer.
//
InitializeComponent();
base.OnInit(e);
}

private void InitializeComponent()
{
this.CustomerDataGrid.ItemCreated += new
System.Web.UI.WebControls.DataGridItemEventHandler(this.CustomerDataGrid_ItemCreated);
this.CustomerDataGrid.ItemDataBound += new
System.Web.UI.WebControls.DataGridItemEventHandler(this.CustomerDataGrid_OnItemDataBound);
this.Load += new System.EventHandler(this.Page_Load);

}

private void CustomerDataGrid_ItemCreated(object sender,
System.Web.UI.WebControls.DataGridItemEventArgs e)
{
int i=1;
i=10 + 12;
}
}
}
 
G

Guest

Hi Girish,
Try remove the
this.CustomerDataGrid.ItemDataBound += new

System.Web.UI.WebControls.DataGridItemEventHandler(this.CustomerDataGrid_OnItemDataBound);
line in the InitializeComponent() because you already call this event on the
html-design OnItemDataBound="CustomerDataGrid_OnItemDataBound".

Hope that helps.
KD

Girish said:
Hello all,

Im wondering why my OnItemDataBound gets fired twice here. I got this sample
code from somewhere online.. and when I put a break point in the method...
it hits the method twice for each row rendered...

Any insights??

Thanks!
Girish


------------
ASPX File
-----------
<%@ Page language="c#" Inherits="MasterDetail.CustomerOrderDataGrid"
EnableViewState="False" CodeBehind="CustomerOrderDataGrid.aspx.cs"
AutoEventWireup="false" %>
<HTML>
<body style="FONT: x-small Verdana, Arial, sans-serif">
<!-- Begin Web Form -->
<form id="CustomerOrderDataGrid" method="post" runat="server">
<p><a href="/DayOfDotNet/">Parent Directory</a></p>
<!-- Begin DataGrid -->
<asp:DataGrid id="CustomerDataGrid" runat="server"
AutoGenerateColumns="False" CellPadding="2"
CellSpacing="0" Font-Names="Verdana, Arial, sans-serif"
BorderColor="Black" BorderWidth="1"
GridLines="Horizontal"
OnItemDataBound="CustomerDataGrid_OnItemDataBound" EnableViewState="False">
<AlternatingItemStyle BackColor="Tan"></AlternatingItemStyle>
<ItemStyle Font-Size="X-Small"></ItemStyle>
<HeaderStyle Font-Size="Small" Font-Names="Arial" Font-Bold="True"
ForeColor="White" BackColor="Maroon"></HeaderStyle>
<Columns>
<asp:BoundColumn Visible="False"
DataField="CustomerID"></asp:BoundColumn>
<asp:TemplateColumn HeaderText="Customer">
<ItemStyle VerticalAlign="Top"></ItemStyle>
<ItemTemplate>
<b>
<%# DataBinder.Eval(Container.DataItem, "CompanyName") %>
</b>
<br>
<%# DataBinder.Eval(Container.DataItem, "Address" ) %>
.. <br>
<%# DataBinder.Eval(Container.DataItem, "City" ) %>
,
<%# DataBinder.Eval(Container.DataItem, "Region") %>
<%# DataBinder.Eval(Container.DataItem, "PostalCode" ) %>
<br>
<br>
<%# DataBinder.Eval(Container.DataItem, "ContactName" ) %>
<br>
<%# DataBinder.Eval(Container.DataItem, "ContactTitle" ) %>
<br>
<%# DataBinder.Eval(Container.DataItem, "Phone" ) %>
</ItemTemplate>
</asp:TemplateColumn>
</Columns>
</asp:DataGrid>
<!-- End DataGrid -->
</form>
<!-- End Web Form -->
</body>
</HTML>


CODE BEHIND
-----------------
using System;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Configuration;

namespace MasterDetail
{
public class CustomerOrderDataGrid : System.Web.UI.Page
{
protected DataGrid CustomerDataGrid;
private DataSet ds = new DataSet();

private void Page_Load(object sender, System.EventArgs e)
{
string sqlStmt = "SELECT top 1 * FROM Customers; SELECT * FROM Orders";
string conString = "server=localhost;database=Northwind;uid=sa;pwd=;";

SqlDataAdapter sda = new SqlDataAdapter(sqlStmt, conString);

sda.Fill(ds);
ds.Tables[0].TableName = "Customers";
ds.Tables[1].TableName = "Orders";

CustomerDataGrid.DataSource = ds.Tables["Customers"];
CustomerDataGrid.DataBind();
}

//Use the OnItemDataBound event handler to dynamically add an embedded
DataGrid
protected void CustomerDataGrid_H(object sender, DataGridItemEventArgs e)
{
//When each row is created in the DataGrid, eval the ItemType
if(e.Item.ItemType == ListItemType.Item ||
e.Item.ItemType == ListItemType.AlternatingItem)
{
//If the ItemType is Item or AlternatingItem,
//Create a new DataGrid object named OrdersDataGrid
}
}

override protected void OnInit(EventArgs e)
{
//
// CODEGEN: This call is required by the ASP.NET Web Form Designer.
//
InitializeComponent();
base.OnInit(e);
}

private void InitializeComponent()
{
this.CustomerDataGrid.ItemCreated += new
System.Web.UI.WebControls.DataGridItemEventHandler(this.CustomerDataGrid_ItemCreated);
this.CustomerDataGrid.ItemDataBound += new
System.Web.UI.WebControls.DataGridItemEventHandler(this.CustomerDataGrid_OnItemDataBound);
this.Load += new System.EventHandler(this.Page_Load);

}

private void CustomerDataGrid_ItemCreated(object sender,
System.Web.UI.WebControls.DataGridItemEventArgs e)
{
int i=1;
i=10 + 12;
}
}
}
Click to expand...
 
G

Girish

Thanks a mil Calvin. This solves my problem.

Girish

Calvin KD said:
Hi Girish,
Try remove the
this.CustomerDataGrid.ItemDataBound += new

System.Web.UI.WebControls.DataGridItemEventHandler(this.CustomerDataGrid_OnItemDataBound);
line in the InitializeComponent() because you already call this event on
the
html-design OnItemDataBound="CustomerDataGrid_OnItemDataBound".

Hope that helps.
KD

Girish said:
Hello all,

Im wondering why my OnItemDataBound gets fired twice here. I got this
sample
code from somewhere online.. and when I put a break point in the
method...
it hits the method twice for each row rendered...

Any insights??

Thanks!
Girish


------------
ASPX File
-----------
<%@ Page language="c#" Inherits="MasterDetail.CustomerOrderDataGrid"
EnableViewState="False" CodeBehind="CustomerOrderDataGrid.aspx.cs"
AutoEventWireup="false" %>
<HTML>
<body style="FONT: x-small Verdana, Arial, sans-serif">
<!-- Begin Web Form -->
<form id="CustomerOrderDataGrid" method="post" runat="server">
<p><a href="/DayOfDotNet/">Parent Directory</a></p>
<!-- Begin DataGrid -->
<asp:DataGrid id="CustomerDataGrid" runat="server"
AutoGenerateColumns="False" CellPadding="2"
CellSpacing="0" Font-Names="Verdana, Arial, sans-serif"
BorderColor="Black" BorderWidth="1"
GridLines="Horizontal"
OnItemDataBound="CustomerDataGrid_OnItemDataBound"
EnableViewState="False">
<AlternatingItemStyle BackColor="Tan"></AlternatingItemStyle>
<ItemStyle Font-Size="X-Small"></ItemStyle>
<HeaderStyle Font-Size="Small" Font-Names="Arial" Font-Bold="True"
ForeColor="White" BackColor="Maroon"></HeaderStyle>
<Columns>
<asp:BoundColumn Visible="False"
DataField="CustomerID"></asp:BoundColumn>
<asp:TemplateColumn HeaderText="Customer">
<ItemStyle VerticalAlign="Top"></ItemStyle>
<ItemTemplate>
<b>
<%# DataBinder.Eval(Container.DataItem, "CompanyName") %>
</b>
<br>
<%# DataBinder.Eval(Container.DataItem, "Address" ) %>
.. <br>
<%# DataBinder.Eval(Container.DataItem, "City" ) %>
,
<%# DataBinder.Eval(Container.DataItem, "Region") %>
<%# DataBinder.Eval(Container.DataItem, "PostalCode" ) %>
<br>
<br>
<%# DataBinder.Eval(Container.DataItem, "ContactName" ) %>
<br>
<%# DataBinder.Eval(Container.DataItem, "ContactTitle" ) %>
<br>
<%# DataBinder.Eval(Container.DataItem, "Phone" ) %>
</ItemTemplate>
</asp:TemplateColumn>
</Columns>
</asp:DataGrid>
<!-- End DataGrid -->
</form>
<!-- End Web Form -->
</body>
</HTML>


CODE BEHIND
-----------------
using System;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Configuration;

namespace MasterDetail
{
public class CustomerOrderDataGrid : System.Web.UI.Page
{
protected DataGrid CustomerDataGrid;
private DataSet ds = new DataSet();

private void Page_Load(object sender, System.EventArgs e)
{
string sqlStmt = "SELECT top 1 * FROM Customers; SELECT * FROM
Orders";
string conString = "server=localhost;database=Northwind;uid=sa;pwd=;";

SqlDataAdapter sda = new SqlDataAdapter(sqlStmt, conString);

sda.Fill(ds);
ds.Tables[0].TableName = "Customers";
ds.Tables[1].TableName = "Orders";

CustomerDataGrid.DataSource = ds.Tables["Customers"];
CustomerDataGrid.DataBind();
}

//Use the OnItemDataBound event handler to dynamically add an embedded
DataGrid
protected void CustomerDataGrid_H(object sender, DataGridItemEventArgs
e)
{
//When each row is created in the DataGrid, eval the ItemType
if(e.Item.ItemType == ListItemType.Item ||
e.Item.ItemType == ListItemType.AlternatingItem)
{
//If the ItemType is Item or AlternatingItem,
//Create a new DataGrid object named OrdersDataGrid
}
}

override protected void OnInit(EventArgs e)
{
//
// CODEGEN: This call is required by the ASP.NET Web Form Designer.
//
InitializeComponent();
base.OnInit(e);
}

private void InitializeComponent()
{
this.CustomerDataGrid.ItemCreated += new
System.Web.UI.WebControls.DataGridItemEventHandler(this.CustomerDataGrid_ItemCreated);
this.CustomerDataGrid.ItemDataBound += new
System.Web.UI.WebControls.DataGridItemEventHandler(this.CustomerDataGrid_OnItemDataBound);
this.Load += new System.EventHandler(this.Page_Load);

}

private void CustomerDataGrid_ItemCreated(object sender,
System.Web.UI.WebControls.DataGridItemEventArgs e)
{
int i=1;
i=10 + 12;
}
}
}
Click to expand...
Click to expand...
 

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