MailMessage email = new MailMessage();

email.From = new MailAddress("account@gmail.com");

email.To.Add("account@gmail.com");

email.CC.Add(new MailAddress("account@gmail.com"));

email.Subject = "Website Contact";

email.IsBodyHtml = true;

email.Body = "<strong>Email:</strong> " + txtEmail.Text;

NetworkCredential smtpUserInfo = new NetworkCredential("account@gmail.com", "yourpassword");

SmtpClient smtp = new SmtpClient("smtp.gmail.com");

smtp.UseDefaultCredentials = false;

smtp.EnableSsl = true;

smtp.Port = 465;

smtp.Credentials = smtpUserInfo;

smtp.Send(email);