First,you need to integrate a
QR Code encoder and
QR Code decoder in vb.net,just then you can encode and decode QR Code in vb.net.
The best method for doing this is to leverage an existing QR code library compatible with the .net framework. A quick search reveals an open source project QRCode Library. The library supports both encoding and decoding qr codes. This should satisfy your condition of generating qr codes for Model Numbers and Product Numbers and then reading them.