System.Net.Mail.MailMessage message = new System.Net.Mail.MailMessage();
message.To.Add(emailAddTextBox.Text);
message.Subject = "Testing";
message.From = new System.Net.Mail.MailAddress("myusername@gmail.com");
message.Body = "Just Testing";
 
System.Net.Mail.SmtpClient smtp = new System.Net.Mail.SmtpClient("smtp.gmail.com",25);

 
SmtpClient client = new SmtpClient();
smtp.Credentials = new System.Net.NetworkCredential("myusername", "mypassword");
smtp.Port = 587; 
smtp.Host = "smtp.gmail.com";
smtp.EnableSsl = true;

 
try
{
smtp.Send(message);
}
catch (Exception exmail)
{
flightNameLabel.Text = "The email cannot be sent" + exmail.ToString();
}