Automatic maill sending from infopath form

try
            {

                MailMessage mail = new MailMessage();

                SmtpClient SmtpServer = new SmtpClient("smtp.mailservername.com");

                mail.From = new MailAddress("username@mailserver.com");

                mail.To.Add("serndermailid");

                mail.Subject = "subject";

                mail.Body = "mail body";



                System.Net.Mail.Attachment attachment;

                attachment = new System.Net.Mail.Attachment("you attachment file path");

                mail.Attachments.Add(attachment);

                SmtpServer.Port = 587;

                SmtpServer.Credentials = new System.Net.NetworkCredential("username@mailserver.com", "password");

                SmtpServer.EnableSsl = true;



                SmtpServer.Send(mail);

//optional for checking
                MessageBox.Show("mail Send");

            }

            catch (Exception ex)
            {
//optional for checking
                MessageBox.Show("mail sending fail");

            }