1、 web.config配置如下：

<system.web>

<httpHandlers>
<add verb="POST,GET" path="ajaxpro/*.ashx" type="AjaxPro.AjaxHandlerFactory,AjaxPro.2"/>
</httpHandlers>

</system.web>

2、添加引用AjaxPro.2.dll

3、后台代码如下

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

namespace used_car
{
public partial class WebForm1 : System.Web.UI.Page
{
protected void Page_Load(object sender,EventArgs e)
{

AjaxPro.Utility.RegisterTypeForAjax(typeof(WebForm1),this.Page);

}
[AjaxPro.AjaxMethod]
public string GetServerTime()
{
return DateTime.Now.ToString();
}
}
}

4、前台调用：如下

<script language="javascript" type="text/javascript">

function testF() {
var dt = used_car.WebForm1.GetServerTime().value;
alert(dt);
}

</script>

<input id="comit" type="button" value="Ok" onclick="testF()" />