How to Manually Control RTS/CTS Using the C#SerialPort Class

public class SerialCommunicationTester:System.IDisposable
{
    private System.IO.Ports.SerialPort_serialPort=null;

    // 0. Open SerialPort.
    public pool Open(
        string portName,
        intbaudRate,
        int dataBits,
        System.IO.Ports.Parity parity,
        System.IO.Ports.StopBits stopBits,
        int readTimeout,
        int writeTimeout,
    ) {
        _serialPort.PortName=portName;
        _serialPort.BaudRate=baudRate;
        _serialPort.DataBits=dataBits;
        _serialPort.Parity=parity;
        _serialPort.StopBits=stopBits;
        _serialPort.Handshake=Handshake.None;
        _serialPort.ReadTimeout=readTimeout;
        _serialPort.WriteTimeout=writeTimeout;

        try{
            _serialPort.Open();
        } catch(Exceptionex){
            Console.WriteLine("SerialPort#OpenFailed...{0}",ex);
        }

        return_serialPort.IsOpen;
    }

    // 1. Set to RTS "High" and 2. Wait for CTS to go "High".
    public bool RtsCtsFlowCtrl(uint timeout){

        if(!_serialPort.IsOpen)return false;

        bool result = true;
        // 1. Set to RTS "High"
        _serialPort.RtsEnable=true;
        Stopwatch sw = new Stopwatch();
        sw.Start();
        // 2. Wait for CTS to go "High".
        while(true){
            Thread.Sleep(0);
            if(_serialPort.CtsHolding)break;
            if (0<timeout&&timeout<=sw.ElappedMilliseconds) {
                result=false;
                break;
            }
        }
        sw.Stop();
        return result;
    }

    // 4.Set to RTS "Low"
    public void RtsOff() {
        if(_serialPort.IsOpen)_serialPort.RtsEnable=false;
    }
}