event not firing in updatepanel

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/*aspx page*/

ASP.NET

<asp:UpdatePanel ID="UpdatePanel1" UpdateMode="Conditional" runat="server">
          <contenttemplate>
              <asp:Label ID="Label1" runat="server" Text="">

 <asp:DropDownList ID="drpSecret" runat="server" Height="16px"
          onselectedindexchanged="drpSecret_SelectedIndexChanged" Width="213px"
             AutoPostBack="True" >
          <asp:ListItem>1
          <asp:ListItem>2
     
          </contenttemplate>
          <triggers>
                <asp:AsyncPostBackTrigger ControlID="drpSecret"
                    EventName="SelectedIndexChanged" />
          </triggers>

/*code behind*/

C#

protected void drpSecret_SelectedIndexChanged(object sender, EventArgs e)
        {
            Label1.Text = drpSecret.SelectedItem.Text;
        }

Posted 10-Jun-12 21:14pm

chirag from Surat

Updated 10-Jun-12 21:25pm

Uday P.Singh

v2

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Rahul.KumarSharma · Answer 1 · 2012-06-10T21:23:00

Use below code. I think this will solve your problem.

C#

<asp:updatepanel id="UpdatePanel1" updatemode="Conditional" xmlns:asp="#unknown">
                             runat="server">
                <triggers>
                  <asp:asyncpostbacktrigger controlid="drpSecret" eventname="SelectedIndexChanged" />
                </triggers>
                <contenttemplate>
                <asp:dropdownlist id="drpSecret" runat="server" height="16px" onselectedindexchanged="drpSecret_SelectedIndexChanged" width="213px">
AutoPostBack="True" >
<asp:listitem>1
<asp:listitem>2
                </asp:listitem></asp:listitem></asp:dropdownlist></contenttemplate>
            </asp:updatepanel>

For more info see:
http://msdn.microsoft.com/en-us/library/system.web.ui.asyncpostbacktrigger.aspx
Thanks,
Rahul Sharma