嘿，

将ur RBLstSeries的AutoPostback属性设置为true
或按照以下内容替换您的代码

Hey,

set AutoPostback property true of ur RBLstSeries
or replace ur code by following

<asp:UpdatePanel runat="server" ID="HoodUpdatePane" UpdateMode="Conditional">

       <ContentTemplate>
           <asp:RadioButtonList ID="RBLstSeries" runat="server" AutoPostBack="True"

               onselectedindexchanged="RBLstSeries_SelectedIndexChanged" >
               <asp:ListItem Text="ELXC" Value="ELXC" Enabled="false"></asp:ListItem>
               <asp:ListItem Text="ELXC-UVi" Value="ELXC-UVi" Enabled="false"></asp:ListItem>
               <asp:ListItem Text="ELX" Value="ELX" Enabled="true" Selected="True"></asp:ListItem>
               <asp:ListItem Text="ELX-UVi" Value="ELX-UVi" Enabled="false"></asp:ListItem>
               <asp:ListItem Text="PG" Value="PG" Enabled="false"></asp:ListItem>
               <asp:ListItem Text="VH2" Value="VH2"></asp:ListItem>
           </asp:RadioButtonList>
           <br />
           <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
       </ContentTemplate>
   </asp:UpdatePanel>

并在aspx.cs页面中添加以下事件

and in aspx.cs page add following event

protected void RBLstSeries_SelectedIndexChanged(object sender, EventArgs e)
   {
       Label1.Text = "Post back Done";
   }

希望您的问题得到解决
祝你好运
快乐的编码

hope ur problem is solved
best Luck
happy coding

RBLstSeries是UpdatePanel的子级，您不需要为其添加AsyncPostBackTrigger.在UpdatePanel上设置ChildrenAsTriggers = true.

RBLstSeries is a child of the UpdatePanel, you don''t need to add AsyncPostBackTrigger for it. Set ChildrenAsTriggers=true on the UpdatePanel.

请检查正在执行页面的浏览器.Googlechrome将不支持Ajax.

谢谢，

灰烬

Please check the browser in which you are executing your page.Google chrome wont support Ajax.

Thanks,

Ashish