.net后台POST传值

/// <summary>          /// 后台POST信息          /// </summary>          public void POST()        {            int a = 0, b = 0, c = 0;            string postData = null;            System.Net.HttpWebRequest request = default(System.Net.HttpWebRequest);            System.IO.Stream requestStream = default(System.IO.Stream);            byte[] postBytes = null;            //封装参数              postData = "a=" + a + "&b=" + b + "&c=" + c;            string url = "http://" + Request.Url.Authority + "/WebForm1.aspx";            request = (System.Net.HttpWebRequest)System.Net.WebRequest.Create(url);            request.ContentType = "application/x-www-form-urlencoded";            request.ContentLength = postData.Length;            request.Timeout = 10000;            request.Method = "POST";            request.AllowAutoRedirect = false;            requestStream = request.GetRequestStream();            postBytes = System.Text.Encoding.ASCII.GetBytes(postData.ToString());            requestStream.Write(postBytes, 0, postBytes.Length);            requestStream.Close();        }