void SendEmail(string fromAddress, string toLine, string subject, string messageBody)
{
  const string host = "smtp.server.com";
  const int port = 1234;
  const string userName = "(user)";
  const string password = "password";

  using (var smtpClient = new SmtpClient(host, port))
  {
    smtpClient.Credentials = new NetworkCredential(userName, password);

    var mailMessage = new MailMessage(fromAddress, toLine, subject, messageBody);
    smtpClient.Send(mailMessage);
  }
}

private void SendEmailToAdmin(string message)
    {
        SmtpSection smtpSection = ConfigurationManager.GetSection("system.net/mailSettings/smtp") as SmtpSection;
        string host = smtpSection.Network.Host;
        if (string.IsNullOrEmpty(host))
        {
            host = "127.0.0.1";
        }

        using (SmtpClient smtpClient = new SmtpClient(host, smtpSection.Network.Port))
        {
            MailMessage mail = new MailMessage(smtpSection.From, Properties.Settings.Default.SupportEmailAddress);
            mail.Subject = Environment.MachineName + ": Error";
            mail.IsBodyHtml = false;
            mail.Body = message;
            smtpClient.Send(mail);
        }
    }