interfacing between gui(pc) and the controller via rs232 using c#

using System.IO.Ports;

	public static SerialPort _serialPort;
         public Form1()
        {
                _serialPort = new SerialPort();
                _serialPort.BaudRate = 9600;
                _serialPort.Parity = Parity.None;
                _serialPort.DataBits = 8;
                _serialPort.StopBits = StopBits.One;
                _serialPort.PortName = COM1;

                try 
                {
                    _serialPort.Open();
                }
                catch (Exception ex)
                {
                    MessageBox.Show(this
                                    , "Error while attempting to open the serial port.\r\n" + ex.Message
                                    , "Open Serial Port Error"
                                    , MessageBoxButtons.OK
                                    , MessageBoxIcon.Error);
                }
                
                if (_serialPort.IsOpen)
                {
					_serialPort.WriteLine("Hello World\r");
				}
		}