What I need is the following.
I would have a ticket with a particular barcode. The PDA will then be used to read this barcode check whether this barcode is valid, by connecting to a database, and then returning whether the code is valid or not.
I will develop the application myself on .NET compact framework that will interact with my database.
I am trying to find several solutions. For example there are bluetooth barcode scanner that scan the code and then send them to the paired device, or else I use an SD barcode reader. But in this case I would have to buy another PDA that has an SD slot.