Programador Novato

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Twilio;
namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            TwilioRestClient client = new Twilio.TwilioRestClient(sid.Text, token.Text);
            var mensaje=client.SendMessage(from.Text, phone.Text, "hola");
            if (mensaje.RestException != null) {
                var error = mensaje.RestException.Message;
                MessageBox.Show(error);
            }
        }
    }
}