title: how to set the flow control of serial port?
body: <p>I  have a <code>SerialPort</code> with a setup with flow control to be 1. How to set it in c#. 
  I have newline <code>char</code> in my port setup and I assume that different to the flow control. My port setup so far is as below. Can anyone help me with setting the flow control please ? Thank you.</p>
  
  <pre><code>SerialPort _comm = new SerialPort
  {
      PortName = string.Concat("COM", comPort),
      BaudRate = 9600,
      Parity = Parity.None,
      DataBits = 8,
      StopBits = StopBits.One,
      ReadTimeout = 1000,
      WriteTimeout = 5000,
      NewLine = "\r"
  };
  </code></pre>