想在我自己的网站上植入动易短信通，按着提供的接口，我写了一个asp.net的demo，运行总是提示“该用户不存在”。
代码如下：
   string id;
   string UserName = "登录短信通后台的账号";
   string SendNum = "15803214226,刘女士,2300";
   string Content = "刘女士，你本月的工资为2300";
   string SendTiming = "0";
   string SendTime = "2012-02-01 17:21:51";
   string Key = "";
   string Reserve = "";
   string MD5String;
   protected void Page_Load(object sender, EventArgs e)
   {
   }
   protected void Button1_Click(object sender, EventArgs e)
   {
       //生成随机数
       Random rdm = new Random();
       int randNum = rdm.Next(1, 1000);
       //id = UserName + DateTime.Now.ToString()+randNum.ToString();
       Guid g=Guid.NewGuid();
       id = g.ToString() + DateTime.Now.ToString("yyyyMMddHHmmss");
       MD5String = getMD5(ID+UserName+Key+SendNum+Content+SendTiming+SendTime);
       SendMsg(id,UserName,SendNum,Content,SendTiming,SendTime,Reserve,MD5String);
   }
   private string getMD5(string input)
   {
       MD5 md5 = new MD5CryptoServiceProvider();
       byte[] t = md5.ComputeHash(Encoding.GetEncoding("gb2312").GetBytes(input));
       StringBuilder sb = new StringBuilder(32);
       for (int i = 0; i < t.Length; i++)
       {
           sb.Append(t[i].ToString("x").PadLeft(2,'0'));
       }
       return sb.ToString().ToUpper();
   }
   private void SendMsg(string id,string username,string sendNum,string content,string sendtiming,string time,string reserve,string msg)
   {
       string url = "链接:http://sms.powereasy.net/MessageGate/Message.aspx (http://sms.powereasy.net/MessageGate/Message.aspx)";
       string postData = "ID=" + id;//id
       postData += ("&UserName=" + username);//用户名
       postData += ("&SendTiming=" +sendtiming );//是否定时发送
       postData += ("&SendTime=" + time);//发送时间
       postData += ("&MD5String=" + msg);//进行校验
       postData += ("&Reserve=" + reserve);//自定义字段
       postData += ("&SendNum=" + sendNum);//接收手机号
       postData += ("&Content=" + content);//短信内容
       Stream outstream = null;
       Stream instream = null;
       StreamReader sr = null;
       HttpWebRequest request = null;
       HttpWebResponse response = null;
       Encoding encode=Encoding.GetEncoding("gb2312");
       byte[] data=encode.GetBytes(postData);
       request = WebRequest.Create(url) as HttpWebRequest;
       request.Method = "POST";
       outstream = request.GetRequestStream();
       outstream.Write(data, 0, data.Length);
       outstream.Flush();
       outstream.Close();
       response = request.GetResponse() as HttpWebResponse;
       instream = response.GetResponseStream();
       sr = new StreamReader(instream, encode);
       Response.Write("<script>alert('"+sr.ReadToEnd()+"');</script>");
   }