how to send e mail on the required e mail address

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ComponentModel;// for backgroundworker class
using System.Net;
using System.Net.Mail;

using System.Threading;

namespace ProLogixPOS
{
    public partial class frmForgetPassword : System.Web.UI.Page
    {
        BackgroundWorker bw;
        public void SendMail()
        {
            MailMessage msg = new MailMessage();
            msg.From = new MailAddress("ham4159@gmail.com");
            msg.To.Add("aaj_4159@yahoo.com");
            msg.Body = "Testing the automatic mail";
            msg.IsBodyHtml = true;
            msg.Subject = "Movie Data";
            SmtpClient smt = new SmtpClient("smtp.gmail.com");

            smt.Port = 25;
            smt.Credentials = new NetworkCredential("ham4159@gmail.com", "123456789");
            smt.EnableSsl = true;
            smt.UseDefaultCredentials = true;
            smt.Send(msg);
            string script = "<script>alert('Mail Sent Successfully');self.close();</script>";
            this.ClientScript.RegisterClientScriptBlock(this.GetType(), "sendMail", script);
        }
       
        protected void Page_Load(object sender, EventArgs e)
        {
          
        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            SendMail();
          }
    }
}