from msdn
protected void Button1_Click(object sender, EventArgs e)
{
System.Threading.Thread.Sleep(3000); Label1.Text = System.DateTime.Now.ToString();
}<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="WebApplication1.WebForm1" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" ><head runat="server"> <title>Untitled Page</title></head><body> <form id="form1" runat="server"> <div> </div> <asp:ScriptManager ID="ScriptManager1" runat="server"> </asp:ScriptManager> <script type="text/javascript"> var prm = Sys.WebForms.PageRequestManager.getInstance(); prm.add_initializeRequest(InitializeRequest);
function InitializeRequest(sender, args) {
if (prm.get_isInAsyncPostBack()) { args.set_cancel(true);
} } function AbortPostBack() { if (prm.get_isInAsyncPostBack()) { prm.abortPostBack(); } } </script> <asp:UpdatePanel ID="UpdatePanel1" runat="server"> <ContentTemplate> <asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" /> <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label> </ContentTemplate> </asp:UpdatePanel> <asp:UpdateProgress ID="UpdateProgress1" runat="server"> <ProgressTemplate> 正在加载数据!<br /> <input type="button" value="stop" onclick="AbortPostBack()" /> </ProgressTemplate> </asp:UpdateProgress> </form></body></html>