SerialPort mySerialPort = new SerialPort("COM2");
mySerialPort.BaudRate = 9600;
mySerialPort.Parity=Parity.None;
mySerialPort.StopBits = StopBits.One;
mySerialPort.DataBits = 8;
mySerialPort.Handshake = Handshake.Non;

mySerialPort.DataReceived += new SerialDataReceivedEvenHandler(DataReceive_Method);

mySerialPort.Open();

mySerialPort.Close();

using System.IO.Ports;
private static void SendSampleData()
{
    SerialPort port = new SerialPort(
        "COM1", 9600, Parity.None, 8, StopBits.One);
    port.Open();
    port.Write("Hello World");
    port.Write(new byte[] { 0x0A, 0xE2, 0xFF }, 0, 3);
    port.Close();
}

namespace SerialPortExample
{
    class SerialPortProgram
    {        
        private SerialPort port = new SerialPort("COM1",
          9600, Parity.None, 8, StopBits.One);

        [STAThread]
        static void Main(string[] args)
        {            
            new SerialPortProgram();
        }

        private SerialPortProgram()
        {
            Console.WriteLine("Incoming Data:");            
            port.DataReceived += new
              SerialDataReceivedEventHandler(port_DataReceived);            
            port.Open();         
            Application.Run();
        }

        private void port_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {            
            Console.WriteLine(port.ReadExisting());
        }
    }