dynamic radiobuttonlist call a method without autoposeback

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C#

i have added a nearly 20 radiobuttonlist this should call a methode while changing selected index but page should not refresh.

Please give me a solution

<pre lang="HTML">

   <asp:ScriptManager ID="ScriptManager1" runat="server">
            </asp:ScriptManager>

            <asp:UpdatePanel ID="updateExamPanal" runat="server" updatemode="Conditional">
            <Triggers>
                  <asp:AsyncPostBackTrigger ControlID="Timer1" EventName="Tick" />
                     </Triggers>
                  <ContentTemplate>
                  <asp:Timer ID="Timer1" runat="server" interval="500000" ontick="Timer1_Tick">
               </asp:Timer>
                  <asp:Panel runat="server" ID="QusPaper">

                              </asp:Panel>
                  </ContentTemplate>

            </asp:UpdatePanel>
</pre>


inside of the   QusPaper panal i have added 20 radiobuttonlist dynamically . that
radiobuttonlist selectedindex changed   event page get reload i don't want reload page