你是更新更新面板条件。

请指定 UpdateMode =条件。

确保使用脚本管理器。

您的整个代码将如下所示。

 <   asp：ScriptManager     ID   =  ScriptManager1    runat   =  server    /  >  
<   asp：UpdatePanel   pan>  ID   =  up4    UpdateMode   = 条件    runat   =   server >  
<   ContentTemplate  >  
 ........ 
<   / ContentTemplate  >  
<   / asp：UpdatePanel   &GT; 跨度> 

I am using an update panel in a modal popupextender where I need to reload the update panel after a button click event.

But I am unable to do it.
Please help!

Below is the thing I used:

<asp:UpdatePanel ID="up4" runat="server">
 <ContentTemplate>
   ........
 </ContentTemplate>
</asp:UpdatePanel>

And in the button click event, I wrote this:

up4.ChildrenAsTriggers = false;
up4.UpdateMode = UpdatePanelUpdateMode.Conditional;
up4.Update();

you are updating update panel conditional.
Please specify UpdateMode="Conditional".
Make sure that you have use script manager.
You whole code will look like this.

<asp:ScriptManager ID="ScriptManager1" runat="server" />
<asp:UpdatePanel ID="up4" UpdateMode="Conditional" runat="server">
 <ContentTemplate>
   ........
 </ContentTemplate>
</asp:UpdatePanel>