WebRequestManager可以喝WebRequest对象一起使用。
WebRequestManager对象的add_completedRequest方法，可以用来处理所有WebRequest对象的请求程序。
Time.aspx
<%@ Page Language="C#" %> <script runat="server"> protected override void OnLoad(EventArgs e) { base.OnLoad(e); Response.Write(DateTime.Now.ToUniversalTime()); } </script>
GlobalCompleted.aspx
<%@ 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"> </script> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title>Networking</title> <script type="text/javascript"> function pageLoad() { Sys.Net.WebRequestManager.add_completedRequest(completedHandler); var webRequest = new Sys.Net.WebRequest(); webRequest.set_url("Time.aspx"); var webRequest2 = new Sys.Net.WebRequest(); webRequest2.set_url(‘TimedSleep.aspx‘); Sys.Net.WebRequestManager.executeRequest(webRequest2); Sys.Net.WebRequestManager.executeRequest(webRequest); } function completedHandler(executor) { if (executor.get_responseAvailable()) { $get(‘placeholder‘).innerHTML += "<br />" + executor.get_webRequest().get_url() + " returned " + executor.get_responseData(); } } </script> </head> <body> <form id="form1" runat="server"> <div> <asp:ScriptManager ID="ScriptManager1" runat="server"> </asp:ScriptManager> <div id="placeholder">processing request</div> </div> </form> </body> </html>
原文：http://www.cnblogs.com/hellolong/p/3990591.html