看了asp.net 的回调技术后不是很理解。还是把写的东西贴下，自己以后学习时候多看看。前台index.aspx页<%@ Page Language="C#" AutoEventWireup="true" CodeFile="index.aspx.cs" Inherits="_Default" %>
<%@ Import Namespace = "System.Text" %>
<!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>用户注册</title>
<mce:script language ="javascript"><!--
//客户端执行的方法
function Success(args,context)
{
message.innerText = args;
}
//下面的方法是当接收服务器方法处理的结果发生异常时调用的方法
function Error(args,context)
{
message.innerText = '发生了异常';
}
// --></mce:script>
</head>
<body>
<form id="form1" runat="server">
<div>
<table border = "1" cellpadding="0" cellspacing = "0" width = "400px">
<tr>
<td width = "100px">用户名</td><td><input type = "text" size = "10" maxlength = "20"
id = "txtUserName" onblur = "CallServerMethod(txtUserName.value,null)" /><span id = "message"></span></td>
</tr>
<tr>
<td>密码</td><td><input type = "password" size = "10" maxlength = "20" id = "txtPwd" /></td>
</tr>
</table>
</div>
</form>
</body>
</html>
后台index.aspx.cs
using System;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
public partial class _Default : System.Web.UI.Page, ICallbackEventHandler
{
string result = "
