我的Ajax之取消异步刷新

代码备份：

    <form id="form1" runat="server">
        <h5>
           可以取消异步刷新</h5>
        <h6>
           </h6>
        <div>
            <asp:ScriptManager ID="s1" runat="server">
            </asp:ScriptManager>
            <asp:UpdatePanel ID="up1" runat="server">
                <ContentTemplate>
                    <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
                    <asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />
                </ContentTemplate>
            </asp:UpdatePanel>
            <asp:UpdateProgress ID="upg1" runat="server" AssociatedUpdatePanelID="up1">
                <ProgressTemplate>
                    Progress……<input id="Button1" type="button" value="button" onclick="CancelAsyncPostBack()" />
                </ProgressTemplate>
            </asp:UpdateProgress>
        </div>
    </form>
>