C# serial communication

public partial class SerialCommunication : Form
{
    public delegate void Delegate();
 
    SerialPort serialPort;
 
    public SerialCommunication()
    {
        serialPort = new SerialPort("COM1", 9600, Parity.None, 8);
 
        serialPort.PortName = "COM1";
        serialPort.BaudRate = 9600;
        serialPort.Parity = Parity.None;
        serialPort.StopBits = StopBits.One;
        serialPort.DataBits = 8;
 
        InitializeComponent();
        serialPort.DataReceived += new SerialDataReceivedEventHandler(serialPort1_DataReceived);
    }
 
    private void button1_Click(object sender, EventArgs e)
    {
        serialPort.Write("$");
        Thread.Sleep(2);
        serialPort.Write("0");
        Thread.Sleep(2);
        serialPort.Write("2");
        Thread.Sleep(2);
        serialPort.Write("E");
        Thread.Sleep(2);
        serialPort.Write("A");
        Thread.Sleep(2);
        serialPort.Write("\r");
        Thread.Sleep(2000);
        serialPort.Write("$");
        Thread.Sleep(2);
        serialPort.Write("0");
        Thread.Sleep(2);
        serialPort.Write("2");
        Thread.Sleep(2);
        serialPort.Write("D");
        Thread.Sleep(2);
        serialPort.Write("A");
        Thread.Sleep(2);
        serialPort.Write("\r");
        Thread.Sleep(1000);
 
        textBox1.Text = "Seriel data written!";
    }
 
    private void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs e)
    {
        string dataRead = "";
 
        //Make thread sleep timer to avoid missing any characters on read
        Thread.Sleep(500);
 
        //Read data based on ASCII encoding
        dataRead = serialPort.ReadExisting();
 
        //Invoke delegate method to get access to foreign thread
        Invoke(new Delegate(delegate()
        {
            textBox1.Text = "Seriel data received: " + dataRead + "!";
        }));
    }
 
    private void btnOpenPort_Click(object sender, EventArgs e)
    {
        //Open the serial port
        //serialPort.Open();
 
        try
        {
            serialPort.Open();
        }
        catch (Exception ex)
        {
            MessageBox.Show("Error: " + ex);
        }
 
        textBox1.Text = "Port open!";
    }
 
    private void btnClosePort_Click(object sender, EventArgs e)
    {
        //Close the serial port
        serialPort.Close();
        textBox1.Text = "Port closed!";
    }
}

                                  

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