using System;

using System.Net;

using System.Web;

​

public class Program

{

    public static void Main()

    {

        string MyUsername = ""; //Your Username At Lifetimesms.com

        string MyPassword = "sa%55pk"; //Your Password At Lifetimesms.com   

        string toNumber = "as"; //Your cell phone number with country code 

        string Masking = "SMS as"; //Your Company Brand Name

        string MessageText = "SMS Sent using .Net";

        string jsonResponse = SendSMS(Masking, toNumber, MessageText, MyUsername, MyPassword);

        Console.Write(jsonResponse);

    //Console.Read(); //to keep console window open if trying in visual studio

    }

​

    public static string SendSMS(string Masking, string toNumber, string MessageText, string MyUsername, string MyPassword)

    {

        String URI = "http://Lifetimesms.com" + "/plain?" + "username=" + MyUsername + "&password=" + MyPassword + "&from=" + Masking + "&to=" + toNumber + "&message=" + Uri.UnescapeDataString(MessageText); // Visual Studio 10-15

        //"&message=" + System.Net.WebUtility.UrlEncode(MessageText);   // Visual Studio 12

        try

        {

            WebRequest req = WebRequest.Create(URI);

            WebResponse resp = req.GetResponse();

            var sr = new System.IO.StreamReader(resp.GetResponseStream());

            return sr.ReadToEnd().Trim();

        }

        catch (WebException ex)

        {

            var httpWebResponse = ex.Response as HttpWebResponse;

            if (httpWebResponse != null)

            {

                switch (httpWebResponse.StatusCode)

                {

                    case HttpStatusCode.NotFound:

                        return "404:URL not found :" + URI;

                        break;

                    case HttpStatusCode.BadRequest:

                        return "400:Bad Request";

                        break;

                    default:

                        return httpWebResponse.StatusCode.ToString();

                }

            }

        }

​

        return null;

    }

}