Sending email in .NET through Gmail

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 System.Net;
using System.Net.Mail;

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

        private void button1_Click(object sender, EventArgs e)
        {
            var fromAddress = new MailAddress("from@gmail.com", "From Name");
            var toAddress = new MailAddress("to@example.com", "To Name");
            const string fromPassword = "fromPassword";
            const string subject = "Subject";
            const string body = "Body";

            var smtp = new SmtpClient
            {
                Host = "smtp.gmail.com",
                Port = 587,
                EnableSsl = true,
                DeliveryMethod = SmtpDeliveryMethod.Network,
                UseDefaultCredentials = false,
                Credentials = new NetworkCredential(fromAddress.Address, fromPassword)
            };
            using (var message = new MailMessage(fromAddress, toAddress)
            {
                Subject = subject,
                Body = body
            })
            {
                string aMsg; 
                try
                {
                    smtp.Send(message);
                    aMsg = "テストメールを送信しました。";
                }
                catch
                {
                    aMsg = "テストメールを送信に失敗しました。";
                }
                MessageBox.Show(aMsg);                
            }
        }
    }
}