I wanna to send email with hostgator server but web con't send.Help me please.

Question

my code is this-

  //MailMessage mm = new MailMessage();

        //SmtpClient sm = new SmtpClient();

        //sm.Credentials = new NetworkCredential("[email protected]", "GEs3ebrE");

        //mm.To.Add(new MailAddress(TextBox1.Text));

        //mm.From = new MailAddress("[email protected]");

        //mm.Subject = TextBox2.Text; ;

        //mm.Body = TextBox3.Text;

        //mm.Priority = MailPriority.High;

        //sm.Port = 25;

        //sm.Host = "50.97.99.170";

        //sm.UseDefaultCredentials = false;

        //sm.DeliveryMethod = SmtpDeliveryMethod.PickupDirectoryFromIis;

        //sm.EnableSsl = false;

        //sm.Send(mm);