Sending Email From the windows application using C# code

1.Design a windows form with 3 labels , 3 text boxes and one Button

2. write the following code on button click event

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.Mail;

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

        private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                string to=textBox1.Text;
                MailMessage ms = new MailMessage();
                ms.To.Add(to);
                ms.From = new MailAddress("rkarthik@gmail.com");
                ms.Subject = textBox2.Text;
                ms.Body = textBox3.Text;
                ms.IsBodyHtml = true;
                SmtpClient smtp = new SmtpClient("localhost",25);
                smtp.Host = "smtp.gmail.com";
                smtp.Credentials = new System.Net.NetworkCredential("rkarthik@augustasoftsol.com", "Your_password");
                smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
                smtp.EnableSsl = true;
                smtp.Send(ms);
                MessageBox.Show("mail Send");            
                                
            }
            catch (Exception ex)
            {

                MessageBox.Show(ex.Message);
            }

        }
    }
}