fingerprint reader software using C#

Question

I am planning to verify the user input for my application using the biometric input. I did some research on net and came up with following options of biometric input:

Answer 1

A colleague of mine was tasked with building a biometric based staff clock-in system for the company we both worked for. We, IT, choose Fingerprints as the biometric source. He researched and used this library from Bayometric - Griaule Fingerprint SDK along with some cheap MS print readers. From what he showed me and talked about at the time, does lead me to believe that this .net library had a nice API and was easy to work with.

The biometric system is still being used today, some 5 years later.