Hello sir, just dropping by(if I can help ^_^)
Why not use Java language, VB, C# rather than Asp.net? Me and my groupmates created that when we where in 2nd year college using vb(for system only(stand alone)) since you can connect the hardware via parallel port,serial etc. Read a lot of tutorial in google and im sure i post our project somewhere in the net ^_^
Here is a sample by the way ^_^
WITH A LITTLE CODE^_^
^_^ Hope can help in a little way ^_^