I suggest you start by first determining that the specific Asus models you are evaluating support the Windows Biometric FrameWork [
^] which would give you a layer of software abstraction above the device's actual hardware sensor (most likely from Authentec) to work with.
If you can use the FrameWork, then start here to learn how to use it: [
^], [
^].
But, warning: to use this in .NET is going to take dealing with Win API calls, and some tricky programming ... unless you can find a ready-made code sample. So, you should search for relevant samples.
Of course, CodeProject is your friend: "A Framework in C# for Fingerprint Verification: "[
^].
Also check out: [
^]
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