<!--UpdateMode="Conditional"设置为不共用的UpdatePanel-->
    <asp:UpdatePanel runat="server" ID="up1" UpdateMode="Conditional">
    <ContentTemplate>
        <asp:Button runat="server" ID="Button1" OnClick="Button1_Click" />
    </ContentTemplate>
    <Triggers>
        <asp:AsyncPostBackTrigger ControlID="Button1" EventName="Click" /><!--这个按钮在当前UpdatePanel中有效-->
    </Triggers>
    </asp:UpdatePanel>