How to display serial port incomming data in ASP.NET

void _serialPort_DataReceived(object sender, SerialDataReceivedEventArgs e)
    {
        int dataLength = _serialPort.BytesToRead;
        byte[] data = new byte[dataLength];
        int nbrDataRead = _serialPort.Read(data, 0, dataLength);
        if (nbrDataRead == 0)
            return;

        result = Encoding.ASCII.GetString(data);

        _serialPort.Close();

        DisplayData(result);
    }

public ActionResult DisplayData(string text)
{
  _serialPort = new SerialPort("COM1", 2400, Parity.Even, 7, StopBits.One);
  _serialPort.Close();
  // Subscribe to event and open serial port for data
  _serialPort.DataReceived += new 
  SerialDataReceivedEventHandler(_serialPort_DataReceived);
  _serialPort.Open();
  ViewBag.Message = text;
  return View();
}