how to click on the insert button without updating the page

Question

I am trying to use UpdatePanel for preventing the whole page from being updating with Triggers but for connecting to server side with database is not working I guess I have to use ajax but I do not know to use it 

 

this the code

 

please help  

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



 </ContentTemplate>
<Triggers>
       <asp:AsyncPostBackTrigger ControlID="btnIdea" EventName="Click" />
              </Triggers>
                          </asp:UpdatePanel>