dot net cf 2.0 not finding GPS serial port. on smartphone what iswrong (c# code)

[Edwin van den Oetelaar]

Hello All,
I am using a ETEN G500+ with WM5 and CF2.0 and want to read the GPS.
It used to work with a WM2003 pda.
I setup the GPS to be available as COM9: to all applications (using settings/gps menu)

      String[] ports = SerialPort.GetPortNames();
// ports just returns COM3:
// while TomTom sees a lot more COM ports
      SerialP = new SerialPort("COM9:"); // BREAKS because COM9: is not valid
      SerialP.BaudRate = 38400;
      SerialP.ReceivedBytesThreshold = 100;
      SerialP.DiscardNull = true;
      SerialP.DtrEnable = false;
      SerialP.Handshake = Handshake.None;
      SerialP.RtsEnable = false;
      SerialP.StopBits = StopBits.One;
      SerialP.DataReceived += SerialP_DataReceived; // handle events

SerialP.Open(); // IOException thrown

How can I solve this, I should be able to use COM9: for GPS input I think..
Please help me fix this problem; Thanks.

Regards,
Edwin