USB communications from ProMicro

Development Boards Arduino
1

Has anyone successfully gotten data sent from a ProMicro to any program via USB using the sketch method Serial.println() (besides the Arduino IDE Serial Monitor)? If so, could you share the super secret handshake? Thanks.

This doesn’t work for me.

        static void Main(string[] args)
        {
            SerialPort _sp = new SerialPort();

            _sp.PortName = "COM3";
            _sp.BaudRate = 9600;
            _sp.Parity = Parity.None;
            _sp.DataBits = 8;
            _sp.StopBits = StopBits.One;
            _sp.Handshake = Handshake.None;
            _sp.Open();

            while (true)
            {
                string line = _sp.ReadLine();
                Debug.WriteLine(line);
            }
        }