try
{                
MailAddress mailAddressFrom = new MailAddress("someone@example.com");
MailAddress mailAddressTo = new MailAddress("someone@example.com");
MailMessage mailMessage = new MailMessage(mailAddressFrom, mailAddressTo);
mailMessage.DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure;
mailMessage.Body = "This is the message body";
mailMessage.Subject = "Hi";
SmtpClient client = new SmtpClient();
client.Host = "";
client.Send(mailMessage);
}
catch (Exception exc)
{
MessageBox.Show(exc.Message);
}