Tim,

>in App.cs I create a reference to the factory so it is created
>Factory factory = mmAppBase.Factory;

Actually, the factory is automatically instantiated for you at the MM .NET level in mmAppBase when the application object is first instantiated.

>I add a property to the app.cs file
>public RfidReaderBase Rfid
>{
> get
> {
> if (rfid == null)
> {
> rfid = factory.CreateRfidReader();
> rfid.Initialize();
> }
> return rfid;
> }
>}
>private RfidReaderBase rfid;

That'll do it!

Best Regards,