lderValues.Append("&firmaadi=" + HttpUtility.UrlEncode("xxxx")); 
              builderValues.Append("&storetype="+ HttpUtility.UrlEncode("3d_pay_hosting")); 
              ASCIIEncoding encoding = new ASCIIEncoding(); 
              string postData = builderValues.ToString(); 
              // Prepare web request... 
              string postUrl = "https://sanalpos.teb.com.tr/servlet/est3Dgate"; 
              HttpWebRequest req1 = (HttpWebRequest)WebRequest.Create(postUrl); 
   
               req1.Method = "POST"; 
              req1.ContentType = "application/x-www-form-urlencoded"; 
              byte[] param = Request.BinaryRead(HttpContext.Current.Request.ContentLength); 
              string strRequest = Encoding.ASCII.GetString(param); 
              string ipnPost = strRequest; 
              strRequest += builderValues.ToString(); 
              req1.ContentLength = strRequest.Length; 
    StreamWriter streamOut = new StreamWriter(req1.GetRequestStream(), 
                                       System.Text.Encoding.ASCII); 
              streamOut.Write(strRequest); 
              streamOut.Close(); 
   
              StreamReader streamIn = new StreamReader(req1.GetResponse().GetResponseStream(), Encoding.ASCII); 
              string strResponse = streamIn.ReadToEnd(); 
              streamIn.Close(); 
   
  Response.Write(strResponse);