string responseBody = "";
            HttpWebRequest request;
            try
            {
                var code = Encoding.UTF8;
                byte[] data = code.GetBytes(strPostdata);

                request = (HttpWebRequest)WebRequest.Create(new Uri(posturl));
                request.UseDefaultCredentials = true;
                request.PreAuthenticate = true;


                request.Credentials = CredentialCache.DefaultCredentials;
                request.Method = "POST";
                request.ContentType = "application/x-www-form-urlencoded";
                request.ContentLength = data.Length;
                using (Stream requestStream = request.GetRequestStream())
                {
                    requestStream.Write(data, 0, data.Length);
                    requestStream.Close();
                }
                HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                StreamReader stream = new StreamReader(response.GetResponseStream(), System.Text.Encoding.UTF8);
                responseBody = stream.ReadToEnd();
                stream.Close();
                response.Close();
            }
            catch (WebException ex)
            {
                responseBody = new StreamReader(ex.Response.GetResponseStream()).ReadToEnd();
            }