AsyncPostBackTrigger

Hi i have this code btnsearch button is outside the content template, and im getting a error, is there any way I can click the btnsearch and

ajax will execute the updatepanel content only..

<asp:UpdatePanel ID="UpdatePanel1" runat="server">
   

 <Triggers>
            <asp:AsyncPostBackTrigger ControlID="btnSearch"  eventname="Click" />

</Triggers>  
        
               
                 <ContentTemplate>

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