>>Aren't there already CRC32 classes out there you could use without reinventing the wheel? e.g. Google [.net crc32 class] yields http://blogs.msdn.com/b/delay/archive/2009/01/14/free-hash-a-reusable-crc-32-hashalgorithm-implementation-for-net.aspx , amongst others.
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>The one I use is simply the official polynomial used by CRC32 in PKZip. This is a common class used across the net. I checked the other one you mentioned. That one, I never saw it before. Did you find any advantage in using that one?

I don't use it. I'm approaching this from the POV that if it's commonly used across the net, someone else has already implemented the class, and you don't have to reinvent the wheel.

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>>http://msdn.microsoft.com/en-us/library/system.security.cryptography.sha1.aspx
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>I went into that link and was unable to find anything in regards to CRC32. Is there?

That link is for SHA. I didn't realize you require CRC32 for your specific case.