环境：VS2005 并在http://ajax.asp.net/default.aspx?tabid=47&subtabid=471下载安装ASP.NET AJAX 1.0 Beta 2
效果：
步骤：
1。在新建网站中新建一个ASP.NET AJAX-Enabled Web Site；
2。添加MyService.asmx，系统自动创建了Default.aspx；
Default.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head runat="server"> <title>Untitled Page</title></head><script type="text/javascript" language="JavaScript"> function Sum() 
{
document.getElementById('button1').value="等于"; document.getElementById('button2').value="减"; document.getElementById('button3').value="乘"; document.getElementById('button4').value="除"; requestSimpleService = MyService.GetSum(document.getElementById('input1').value,document.getElementById('input2').value, OnRequestComplete); return false;
} function Diff() { document.getElementById('button1').value="加"; document.getElementById('button2').value="等于"; document.getElementById('button3').value="乘"; document.getElementById('button4').value="除"; requestSimpleService = MyService.GetDiff(document.getElementById('input3').value,document.getElementById('input4').value, OnRequestComplete); return false; } function Mul() { document.getElementById('button1').value="加"; document.getElementById('button2').value="减"; document.getElementById('button3').value="等于"; document.getElementById('button4').value="除"; requestSimpleService = MyService.GetMul(document.getElementById('input5').value,document.getElementById('input6').value, OnRequestComplete); return false; } function Quotient() { document.getElementById('button1').value="加"; document.getElementById('button2').value="减"; document.getElementById('button3').value="乘"; document.getElementById('button4').value="等于"; requestSimpleService = MyService.GetQuotient(document.getElementById('input7').value,document.getElementById('input8').value, OnRequestComplete); return false; } function OnRequestComplete(result) { document.getElementById('Flag').innerHTML=result; //alert(result); }</script><body> <form id="form1" runat="server"> <asp:scriptmanager ID="Scriptmanager1" runat="server"> <Services> <asp:ServiceReference Path="MyService.asmx"/> </Services> </asp:scriptmanager> <table border="0" cellspacing="3" bgcolor="#898989"> <tr bgcolor="#e9e9e9"> <td> <input type="text" id="input1" size="20" /></td> <td align="center"> +</td> <td> <input type="text" id="input2" size="20" /></td> <td style=" 25px"> <input id="button1" type="button" value="和" onclick="return Sum()" /></td> <td rowspan="4" style=" 25px"> <label id="Flag" style="color:Red;"></label> </td> </tr> <tr bgcolor="#e9e9e9"> <td> <input type="text" id="input3" size="20" /></td> <td align="center"> －</td> <td> <input type="text" id="input4" size="20" /></td> <td style=" 25px"> <input id="button2" type="button" value="减" onclick="return Diff()" /> </td> </tr> <tr bgcolor="#e9e9e9"> <td> <input type="text" id="input5" size="20" /></td> <td align="center"> *</td> <td> <input type="text" id="input6" size="20" /></td> <td style=" 25px"><input id="button3" type="button" value="乘" onclick="return Mul()" /> </td> </tr> <tr bgcolor="#e9e9e9"> <td> <input type="text" id="input7" size="20" /></td> <td align="center"> /</td> <td> <input type="text" id="input8" size="20" /></td> <td style=" 25px"><input id="button4" type="button" value="除" onclick="return Quotient()" /> </td> </tr> </table> </form></body></html>MyService.csusing System;using System.Web;using System.Collections;using System.Web.Services;using System.Web.Services.Protocols;/**//// <summary>/// MyService 的摘要说明/// </summary>[Microsoft.Web.Script.Services.ScriptService]public class MyService : System.Web.Services.WebService {
public MyService () { //如果使用设计的组件，请取消注释以下行 //InitializeComponent(); 
} [WebMethod] public string GetSum(string a, string b) { double num1, num2; try { num1 = Convert.ToDouble(a); num2 = Convert.ToDouble(b); return (num1 + num2).ToString(); } catch { return "请输入数字"; } } [WebMethod] public string GetQuotient(string a, string b) { double num1, num2; try { num1 = Convert.ToDouble(a); num2 = Convert.ToDouble(b); if (num2 == 0) { return "被除数不能为零"; } else return Math.Round(num1 / num2, 2).ToString(); } catch { return "请输入数字"; } } [WebMethod] public string GetDiff(string a, string b) { double num1, num2; try { num1 = Convert.ToDouble(a); num2 = Convert.ToDouble(b); return (num1 - num2).ToString(); } catch { return "请输入数字"; } } [WebMethod] public string GetMul(string a, string b) { double num1, num2; try { num1 = Convert.ToDouble(a); num2 = Convert.ToDouble(b); return (num1 * num2).ToString(); } catch { return "请输入数字"; } } }