Asp.net ajax实现任务提示页面的简单代码

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<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
    void WaitFiveSeconds(object o, EventArgs e)
    {
        System.Threading.Thread.Sleep(5000);
        Label1.Text = DateTime.Now.ToLongTimeString( );
    }
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>ASP.NET AJAX</title>
</head>
<body>
<form id="form1" runat="server">
    <asp:ScriptManager ID="ScriptManager1" runat="server" />
    <asp:UpdatePanel ID="UpdatePanel1" runat="server">
        <ContentTemplate>
            <asp:Button ID="Button1" runat="server" Text="Do something" OnClick="WaitFiveSeconds" /><br />
            <asp:Label ID="Label1" runat="server" />
        </ContentTemplate>
    </asp:UpdatePanel>
    <asp:UpdateProgress ID="UpdateProgress1" runat="server" AssociatedUpdatePanelID="UpdatePanel1">
        <ProgressTemplate>
        <div style="position: absolute; left: 200px; top: 150px; border: solid 1px black; padding:4px;">
            Loading, please stand by ...
        </div>
        </ProgressTemplate>
    </asp:UpdateProgress>
</form>
</body>
</html>