asp.net updatepanel

<asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">

    </asp:ToolkitScriptManager>

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

 UpdateMode="Conditional">

 <ContentTemplate>

///////////////////내용////////////////

</ContentTemplate>

         <Triggers>//외부 이벤트 updatepanel에 등록

        <asp:AsyncPostBackTrigger ControlID = "btn1" EventName = "click" />

        </Triggers>

    </asp:UpdatePanel>

http://webgenie.tistory.com/4