protected void Button1_Click(object sender, EventArgs e)
        {
            try
            {
                MailMessage mail = new MailMessage();
                SmtpClient SmtpServer = new SmtpClient("smtp.gmail.com");

                mail.From = new MailAddress("sachinsnimbalkar@gmail.com");
                mail.To.Add("vaibhavlokhande55@gmail.com");
                mail.Subject = "Test Mail from sachin nimbalkar";
                mail.Body = "This is for testing SMTP mail from GMAIL";

                SmtpServer.Port = 587;
                SmtpServer.Credentials = new System.Net.NetworkCredential("sachinsnimbalkar@gmail.com", "YourPassword");
                SmtpServer.EnableSsl = true;

                SmtpServer.Send(mail);
                Button1.Text ="mail Send";
            }
            catch (Exception ex)
            {
                Button1.Text=ex.ToString();
            }
        }