Hi, I have ready the solution that works with vb.net using DigitalPersona U.are.U 4000B and 4500 readers, please change your proyect to fixed price to $150usd.
Please check my portfolio.
My dll let you enrollement process and verification process, the workflow for verification is:
a) in the screen you enter the userid, customer number, etc.
b) using this id you retrieve the fingerprints from database (2 large strings)
c) make a dll call passing firgerprints
d) the reader take live fingerprint from reader (3 tries per finger) and return true or false is match.
the workflow for enrollement is:
a) the dll takes 3 samples for index rigth finger and 3 samples for left index finger
b) this process returns 2 large strings for easy storing in database
c) you save userid or customerid, etc with this 2 strings
I can send you a demo video.