using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO;
using System.Web;
using System.Net;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            String message = HttpUtility.UrlEncode("Hello world!");
            SendSMSToURL("http://www.isms.com.my/isms_send.php?un=username&pwd=password&dstno=60123456789&msg=" + message + "&type=1&sendid=12345");
        }

        private string SendSMSToURL(string getUri)
        {
            string SentResult = String.Empty;

            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(getUri);

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            StreamReader responseReader = new StreamReader(response.GetResponseStream());

            String resultmsg = responseReader.ReadToEnd();
            responseReader.Close();

            int StartIndex = 0;
            int LastIndex = resultmsg.Length;

            if (LastIndex > 0)
                SentResult = resultmsg.Substring(StartIndex, LastIndex);

            responseReader.Dispose();

            return SentResult;
        }
    }
}