js中XMLHttpRequest请求.ashx页面，在C#顶用哪个

  StringBuilder builder = new StringBuilder();         builder.Append("http://xxx.com.cn/misc.ashx");         builder.Append("?");         builder.Append("action=gold");         builder.Append("&");         builder.Append("token="+strToken+"");         HttpWebResponse rsp = null;         HttpWebRequest req = null;         req = (HttpWebRequest)WebRequest.Create(new Uri(builder.ToString()));         req.ContentType = "application/x-www-form-urlencoded";         req.Accept = "*/*";         req.Timeout = 30000;//30秒连接不成功就中断         req.Method = "GET";         rsp = (HttpWebResponse)req.GetResponse();         Stream rspStream = rsp.GetResponseStream();         StreamReader sr = new StreamReader(rspStream, Encoding.GetEncoding("utf-8"));         result = sr.ReadToEnd();         sr.Close();               XmlDocument xmlDoc = new XmlDocument();         xmlDoc.LoadXml(result);