#region Namespace Inclusions
using System;
using System.IO.Ports;
#endregion

namespace SerialConsoleExample
{
  class SerialPortProgram
  {
    // Create the serial port with basic settings
    private SerialPort port = new SerialPort("COM5", 9600, Parity.None, 8, StopBits.One);

    [STAThread]
    static void Main(string[] args)
    {
      // Instatiate this class
      new SerialPortProgram();
    }

    private SerialPortProgram()
    {
        Console.WriteLine("Incoming Data:");
              
        // Begin communications
        if (port.IsOpen)
        {
            port.Close();
        }
        port.Open();

        port.NewLine = "\n";
        Console.WriteLine(port.ToString());
        Console.WriteLine(port.PortName);
        Console.WriteLine(port.NewLine.ToString());
        Console.WriteLine(port.IsOpen.ToString());
        Console.WriteLine(port.ReadExisting());                
        
        //Enter an application loop to keep this thread alive
        //Application.Run();
        int i = 0;
        while (i < 1000)
        {
            // Attach a method to be called when there      // is data waiting in the port's buffer
            port.DataReceived += new SerialDataReceivedEventHandler(port_DataReceived);
            Console.WriteLine(port.ReadExisting());
            i++;
        }
        port.Close();
    }

    private void port_DataReceived(object sender,      SerialDataReceivedEventArgs e)
    {
      // Show all the incoming data in the port's buffer
      Console.WriteLine(port.ReadExisting());
    }
  }
}

public SerialPort sp;
string dataReceived = string.Empty;
private delegate void SetTextDeleg(string text);

private void FormLoad()
{
     sp = new SerialPort("COM1", 9600, Parity.None, 8, StopBits.One);
     this.sp.DataReceived += new SerialDataReceivedEventHandler(sp_DataReceived);
     sp.Open();
}

void sp_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
     try
     {
          Thread.Sleep(500);
           string x = sp.ReadLine(); // will read to the first carriage return
           this.BeginInvoke(new SetTextDeleg(si_DataReceived), new object[] { x });
      }
      catch
      { }
}

private void si_DataReceived(string data)
{
      dataReceived = data.Trim();

      // Do whatever with the data that is coming in.
}

//call this after port.Open()
port.DtrEnable = true;