Hi.. 

'listener.Start()' is not executed in 'BluetoothChat'

There is unknown(0x6) error at 'listener.Start()'

I don't know what is the problem.(error)

Please help me.

Wierd.  Doesn't sound like a .NET exception at all.  What platform are you on Win32 or CE/WM, and do you have the Widcomm stack?  Can you show me a screenshot or something of the error?

Platform is WinCE.

That green box(client = listener.AcceptBluetoothClient();) make a errormessage.

ErrorMessage: Not listening. You must call the Start() method before calling this method.

http://postfiles2.naver.net/20100203_161/orangewoo2_1265162254899zM6YF_jpg/1_00001_orangewoo2.jpg?type=w3

However, I called Start() method already !

Firslt if you called Start and it failed -- an exception means "I could not complete the operation", then clearly one can't then go on and call other methods that depend on the Start. :-)  Catching an exception and continuing isn't good practice. :-)

On the error in Start, can you change the handler to do e.g. MessageBox.Show(ex) ' and not ex.Message