using System;
    using System.Collections.Generic;
    using System.Text;
    using System.Net;
    using System.IO;

    namespace AlphaSMS{
        class Program{
            static void Main(string[] args){
            string result = "";
                WebRequest request = null;
                HttpWebResponse response = null;
                try{
                    String to = "016xxxxxxxx,017xxxxxxxx"; //Recipient Phone Number multiple number must be  separated by comma
                   String username = "YourUserNameHere"; //Your Username
                   String hash_token = "YourTokenCodeHere"; //generate token from the control panel
                   String message = System.Uri.EscapeUriString("my messages"); //do not use single quotation   (') in the message to avoid forbidden result
                   String url = "http://alphasms.biz/index.php?app=ws&op=pv&u=" + username + "&h=" + hash_token + "&to=" + to + "&msg=" + message;
                   request = WebRequest.Create(url);

                    // Send the 'HttpWebRequest' and wait for response.
                    response = (HttpWebResponse) request.GetResponse();
                    Stream stream = response.GetResponseStream();
                    Encoding ec = System.Text.Encoding.GetEncoding("utf-8");
                    StreamReader reader = new
                    System.IO.StreamReader(stream, ec);
                    result = reader.ReadToEnd();
                    Console.WriteLine(result);
                    reader.Close();
                    stream.Close();
                    } catch (Exception exp){
                    Console.WriteLine(exp.ToString());
                    } finally {
                    if (response != null)
                        response.Close();
                }
            }
        }
    }