about my mini project

MailMessage mail = new MailMessage();
mail.To.Add(txtTo.Text);
//mail.To.Add("Another Email ID where you wanna send same email");
mail.From = new MailAddress("test.sathish4303@gmail.com");
mail.Subject = txtSubject.Text;
mail.Body = txtBody.Text;
mail.IsBodyHtml = true;
SmtpClient smtp = new SmtpClient();
check_mailid();
smtp.Host = "smtp.gmail.com"; //Or Your SMTP Server Address
smtp.Credentials = new System.Net.NetworkCredential("test.mail03@gmail.com", "xxxyyy");
smtp.EnableSsl = true;
smtp.Send(mail);