using System;

using System.Text;

using System.Web;

using System.Net;

using System.IO;

​

public class Program

{

  public static void Main()

  {

      string apiToken = "xxxxxxx"; //Your api_token At Lifetimesms.com

      string apiSecret = "xxxxx"; //Your api_secret  At Lifetimesms.com  

      string toNumber = "923xxxxxxxxx,923xxxxxxxxx,923xxxxxxx"; //Your cell phone number with country code 

​

​

  string jsonResponse=  SendSMSPOST(apiToken, apiSecret, toNumber);

    Console.WriteLine(jsonResponse);

  }

  public static string SendSMSPOST(string apiToken, string apiSecret, string toNumber)

    {

       String api = "http://lifetimesms.com/network-lookup" ;

        String parameters = "api_token=" + apiToken + "&api_secret=" + apiSecret + "&phone_number=" + toNumber;

        var httpWebRequest = (HttpWebRequest)WebRequest.Create(api);    

    httpWebRequest.Accept = "application/json";

        httpWebRequest.ContentType = " application/x-www-form-urlencoded";   

        httpWebRequest.Method = "POST";

    using (var streamWriter = new System.IO.StreamWriter(httpWebRequest.GetRequestStream()))

                {

​

                    parameters = "api_token=" + apiToken + "&api_secret=" + apiSecret + "&phone_number=" + toNumber;

​

                    streamWriter.Write(parameters);

                    streamWriter.Flush();

                    streamWriter.Close();

                }

​

                var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();

     using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))

                {

                    var result = streamReader.ReadToEnd();

                   return result.ToString();

         }

​

      return null;

    }

}