private static string sendMail(System.Net.Mail.MailMessage mm)
{
     try
     {
          string smtpHost = "smtp.gmail.com";
          string userName = "username@gmail.com";//write your email address
          string password = "************";//write password
          System.Net.Mail.SmtpClient mClient = new System.Net.Mail.SmtpClient();
          mClient.Port = 587;
          mClient.EnableSsl = true;
          mClient.UseDefaultCredentials = false;
          mClient.Credentials = new NetworkCredential(userName, password);
          mClient.Host = smtpHost;
          mClient.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;
          mClient.Send(mm);
}
catch (Exception ex)
{
          System.Console.Write(ex.Message);
}