System IO Ports C# by API

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  4. New SerialPort(COM1, 19200))
using System;
using System.Collections.Generic;
using System.Text;
using System.IO.Ports;
class Serial
{
 public static void Main()
 {
      byte[] buffer = new byte[256];
      using (SerialPort sp = new SerialPort("COM1", 19200))
      {
           sp.Open();
           //read directly
           sp.Read(buffer, 0, (int)buffer.Length);
           //read using a Stream
           sp.BaseStream.Read(buffer, 0, (int)buffer.Length);
      }
 }
}