using System;

using System.IO.Ports;

using System.IO;

​

public class Program

{

    static SerialPort mySerialPort;

    static void Main(String[] args)

    {

        mySerialPort = new SerialPort("COM3", 9600);

        // Add our Event Handler

        mySerialPort.DataReceived += new SerialDataReceivedEventHandler(mySerialPort_DataRecieved);

        try

        {

            mySerialPort.Open();

        }

        catch (IOException ex)

        {

            Console.WriteLine(ex);

        }

    // Any other Code here...   

    }

​

    public static void mySerialPort_DataRecieved(object sender, SerialDataReceivedEventArgs e)

    {

        try

        {

            Console.Write(mySerialPort.ReadExisting());

        }

        catch (IOException ex)

        {

            Console.WriteLine(ex);

        }

    }

}