Questions about how to store fingerprints from a reader into sql database?

[smartboy]

hello everyone
i'll work soon on a program that should take the finger print from a reader and save it in sql server to
determine employees's presence and leaving>
i searched alot but still confused from where i shoud start?
my questions are:
1- Is the written code differ from one reader to another? or any code apply to all readers?
2- I knew that i should take the image and save it in varbinary in sql server, but how i shall take it?
3- Libraries i should use in visual studio 2010 and c#?
4- should i write license with a definite number of fingerprints save?
5- when i try to approve an employee pressece (by taking his fingerprint), shall i go directly to his id in SQL server and compare his fingerprint stored with the new one entered, OR i Should take the fingerPrint and search for it? what is better and more professional?
Thanks in advance for every one wants to help me

[sandeepthomas]

Hi friend
Am not an expert at all in this. But why you dont think about storing it as hash in the table. I mean you just hash the fingerprint image and store that hash. And when any comparison needed, just compare the hashes from the scanner and hashes in DB. Does that work? I think you can use SHA256 for that... Also please let me know if that doesnt work..