asp.netajax调用一例

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<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="WebApplication2.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></title>
</head>
<body>
    <form id="form1" runat="server">
    <script type="text/javascript">
        function getResult(arg,context) {
            <%=Page.ClientScript.GetCallbackEventReference(this, "arg", "page_callback", "context", "page_error", false)%>;
        }
        
        function page_callback(arg, context) {
            document.getElementById("result").innerHTML = arg;
        }

        function page_error(arg, context) {
            alert("error");
        }
    </script>
    <div id="result">
    </div>
    <input id="Button1" type="button" value="button" onclick="getResult(null,null)" />
    </form>
</body>
</html>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace WebApplication2
{
    public partial class WebForm1 : System.Web.UI.Page, ICallbackEventHandler
    {
        private string result = "";       

        protected void Page_Load(object sender, EventArgs e)
        {

        }

        public string GetCallbackResult()
        {
            return result;
        }

        public void RaiseCallbackEvent(string eventArgument)
        {
            result = DateTime.Now.ToString();
        }
    }
}