微信.NET 微信的开发者验证ASP.NET C#代码

<%@ WebHandler Language="C#" class="v" %>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.IO;
using System.Security.Cryptography;
using System.Xml;
/// <summary>
/// v 的摘要说明
/// </summary>
public class v : IHttpHandler
{
       public void ProcessRequest(HttpContext context)
       {
        //如果 是 验证  则 直接 退出 
        if (ProcessRequest2(context))
            return;
        //下面放置 具体用户信息交互代码
       }

    /// <summary>
    ///    微信 开发者 验证 模块
    /// </summary>
    /// <param name="context"></param>
    public bool ProcessRequest2(HttpContext context)
    {
        context.Response.ContentType = "text/plain";
        try
        {
            string echoStr = context.Request["echoStr"];  

            if (!string.IsNullOrEmpty(echoStr))
            {
                context.Response.Write(echoStr);
                return true;
            }
            else
            {
            }
        }
        catch (Exception e)
        {
        }
        return false;
    }

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