...
   public void analitic(string inf)
        {
            string phone = inf.Substring(0, inf.IndexOf('?'));
            inf = inf.Substring(inf.IndexOf('?') + 1);
            string source = inf.Substring(0, inf.IndexOf('?'));
            inf = inf.Substring(inf.IndexOf('?') + 1);
            string dest= inf.Substring(0, inf.IndexOf('?'));
            send_post(phone, source, dest);
        }
        public void send_post(string phone,string source,string dest)
        {
            string url = "https://" + dest_ip + ":" + dest_port + "/common_api/1.0/create_order HTTP/1.1";
            string data=null;
            //phone=89123456789&source=SOURCE&source_time=20120501100000&dest=DEST&customer=CUSTOMER&comment=COMMENT&crew_group_id=1
            data += "phone=" + phone + "&";
            data += "source=" + source + "&";
            data+="source_time=20120501100000"+"&";
            data += "dest=" +dest+ "&";
            Console.WriteLine(POST(url,data));
        }
        string POST(string Url, string Data)
        {
            string Out = String.Empty;
            try
            {
                WebRequest req = WebRequest.Create(Url);
                req.Method = "POST";
                req.Timeout = 100000;
                Console.WriteLine(GetHashString(Data));
                //req.Headers.Add("Signature"/*HttpRequestHeader.Authorization*/, GetHashString(Data)+"123");
                byte[] sentData = Encoding.GetEncoding(1251).GetBytes(Data);
                req.ContentLength = sentData.Length;
                Stream sendStream = req.GetRequestStream();
                sendStream.Write(sentData, 0, sentData.Length);
                sendStream.Close();
                WebResponse res = req.GetResponse();
                Stream ReceiveStream = res.GetResponseStream();
                StreamReader sr = new StreamReader(ReceiveStream, Encoding.UTF8);
                Char[] read = new Char[256];
                int count = sr.Read(read, 0, 256);
                while (count > 0)
                {
                    String str = new String(read, 0, count);
                    Out += str;
                    count = sr.Read(read, 0, 256);
                }
            }
            catch
            {
                Console.ForegroundColor = ConsoleColor.Red;
                Console.WriteLine("404!Ошибка сервера назначения!");
            }
               return Out;
        }



                string GetHashString(string s)
                 {
                    //переводим строку в байт-массим
                     byte[] bytes = Encoding.Unicode.GetBytes(s);

                    //создаем объект для получения средст шифрования
                    MD5CryptoServiceProvider CSP =  new MD5CryptoServiceProvider();
          //вычисляем хеш-представление в байтах
      byte[] byteHash = CSP.ComputeHash(bytes);

      string hash = string.Empty;

      //формируем одну цельную строку из массива
      foreach (byte b in byteHash)
          hash += string.Format("{0:x2}", b);

      return hash;
    }