EnableViewState And DROPDOWNLIST

[Tom]

<%@ Page Language="vb" AutoEventWireup="false"
EnableViewState="false" .... %>

<FORM id="frmMyForm" method="post" runat="server">
1) Inline Items (In aspx File) :
<ASPROPDOWNLIST id="drpStatesOne" runat="server"
enableviewstate="false">
<ASP:LISTITEM value="1">A</ASP:LISTITEM>
<ASP:LISTITEM value="2">B</ASP:LISTITEM>
<ASP:LISTITEM value="3">C</ASP:LISTITEM>
<ASP:LISTITEM value="4">D</ASP:LISTITEM>
</ASPROPDOWNLIST>
<BR>
2) Items added in Page_Init Event :
<ASPROPDOWNLIST id="drpStatesTwo" runat="server"
enableviewstate="false">
</ASPROPDOWNLIST>
<BR>
3) Items added in Page_Load Event :
<ASPROPDOWNLIST id="drpStatesThree" runat="server"
enableviewstate="false">
</ASPROPDOWNLIST>
<BR>
<INPUT type=submit value="Check It">
</FORM>

Code Behind ....

Private Sub Page_Init(ByVal sender As System.Object,
ByVal e As System.EventArgs) Handles MyBase.Init
InitializeComponent()
With drpStatesTwo
.Items.Add("A")
.Items.Add("B")
.Items.Add("C")
.Items.Add("D")
End With
End Sub

Protected drpStatesOne As
System.Web.UI.WebControls.DropDownList
Protected drpStatesTwo As
System.Web.UI.WebControls.DropDownList
Protected drpStatesThree As
System.Web.UI.WebControls.DropDownList
Private Sub Page_Load(ByVal sender As System.Object,
ByVal e As System.EventArgs) Handles MyBase.Load
With drpStatesThree
.Items.Add("A")
.Items.Add("B")
.Items.Add("C")
.Items.Add("D")
End With
End Sub

 

[Tom]

the problem ....
(sorry in last post i just put code)
Every where the EnableViewState property is set
to "false", but still the state (The Item user selects
remain selected even after submitting the form) for first
and second dropdown list.
Expert comments needed.
Regards,

 

[adavir]

Your Page_Load will get fired before your event. i.e your event is the last method to get fired.

So when a post back occurs your DropdownList is reset in Page_Load every time. By the time your event gets fired the selected index has not been changed since the DropdownList constructor was called.

what you need to do is when binding put the if(!Page.IsPostBack) conditional around around your databinding code.

However with ViewState disabled your evet will still not get fired and if it does your DropdownList will not regester a SelectedIndex change.

the best option is to overload your dropdownlist, intercept it at the RaisePostBack event stage to capture the selectedVale when the dropdownlist selected index is changed.