asp.net类似QQ、人人的即时消息提醒

var counter="<%=counter %>" ;
function getNewDyns() {
$.post("NewDyn.ashx", { "count": counter }, function(data, status) {
if (status == "success" && data>0) {
$("#newDynTip").html("您有"+ data + "条新消息！");
}
})
}

<div  class="center"><a href="javascript:location='Home.aspx'" id="newDynTip"></a></div>

using System;
using System.Web;
using System.Web.SessionState;

using BLL;

namespace Zone.owner
{
/// <summary>
/// $codebehindclassname$ 的摘要说明
/// </summary>

public class NewDyn : IHttpHandler,IRequiresSessionState
{

public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/plain";
int record=-1;
int oldCount = Convert.ToInt32(context.Request["count"]);
DynBLL.GetPaged(100,1,ref record,Convert.ToInt32(context.Session["userID"]));
context.Response.Write(record-oldCount);
}

public bool IsReusable
{
get
{
return false;
}
}
}
}