System.Net.Mail.SmtpClient.CheckHostAndPort C# (CSharp) Method

        private void CheckHostAndPort()
        {
            if (_host == null || _host.Length == 0)
            {
                throw new InvalidOperationException(SR.UnspecifiedHost);
            }
            if (_port <= 0 || _port > MaxPortValue)
            {
                throw new InvalidOperationException(SR.InvalidPort);
            }
        }