Sending Email Using C#.net-LocalMachine

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

        //All Variable Declarations
        String senderAddress = string.Empty;
        String receiveraddress = string.Empty;
        String emailSubject = string.Empty;
        String emailMessageText = string.Empty;
        MailMessage mail = new MailMessage();
        SmtpClient client = new SmtpClient("smtp.gmail.com",587);
           

        private void btnEmail_Click(object sender, EventArgs e)
        {

            try
            {
                //Get the Values of Controls

                senderAddress = txtSenderEmail.Text;
                receiveraddress = txtReceiverEmail.Text;
                emailSubject = txtSubject.Text;
                emailMessageText = txtMessageBody.Text;

                //Pass the Values 
                mail.From = new MailAddress(senderAddress, "xxxxxxxxxx", System.Text.Encoding.UTF8);
                mail.To.Add(receiveraddress);
                mail.Subject = emailSubject;
                mail.Body = emailMessageText;
                client.UseDefaultCredentials = false;
                client.Credentials = new NetworkCredential("xxxxxxx@gmail.com", "xxxxxx");
                client.EnableSsl = true;
                client.Send(mail);
                System.Windows.Forms.MessageBox.Show("Email Sent Successfully");
               


            }
            catch (Exception mailException)
            {
                System.Windows.Forms.MessageBox.Show("Message Not Sent ,Error:  " + mailException.Message);
                throw;
            }
            finally
            { 
            
            }
           
           

        }
    }
}