Reading From a COM Port

private void connectButton_Click(object sender, System.EventArgs e)
        {
            connectButton.Enabled = false;
            disconnectButton.Enabled = true;
            COMlistBox.Enabled = false;
            port.PortName = "COM23";
            //port.PortName = COMlistBox.SelectedItem as string;
            port.Parity = Parity.None;
            port.BaudRate = 9600;
            port.StopBits = StopBits.One;
            port.DataBits = 8;
            port.Open();
            timer1.Enabled = true;
        }

private void ReadData()
        {
            byte[] bData = new byte[256];

            try
            {
                //Code hangs at this point
                port.Read(bData, 0, (int)bData.Length);

                protocol.ParseBuffer(bData);
            }
            catch(Exception e)
            {
                System.Diagnostics.Debug.WriteLine(e.ToString());
                //swallow it.
            }

            DisplayNMEARawData(bData);
            DisplayGeneralInfo();
            DisplaySatellites();
        }