updatePanel stops the buttons in side it

Question

I have use update panel to update partial of the page not all. However, the button inside  update panel stops working and this button inserts data to database

 

please help

<asp:ScriptManager ID="ScriptManager1" runat="server" />
     <asp:UpdatePanel ID="UpdatePanel1" runat="server">
 <ContentTemplate>
.
.
.       other lines of the code
.
.

<asp:Button ID="btnUpload" runat="server" Text="Upload" onClick="Upload" ValidationGroup="Click"/>

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