What is the best way to create and validate an MD5 file fingerprint?

I want to use WMI to create an MD5 fingerprint for a large file (>= 50
Mb).

How should I go about it?

I know of 3 (freeish) controls I can use:

1) http://www.slavasoft.com/porderandprice.htm
QuickHash Library 3.0 1 License = $149.95, but unlicensed use is
premitted - giving a 10 second program delay. The program is a dll,
it comes with comprehensive chm help

2) RSP Checksum OCX http://rspsoftware.clic3.net
340KB License: Free to try, $50(US) to buy. I haved looked
into the restrictions on this. This program is an ocx with basic chm
help

3) XStandard's MD5 Checksum Component, http://www.xstandard.com
This one is actually freeware. It's a dll with very basic
documentation (there are only two calls which can be made to it), but
they do give an ASP example in VBScript.

Alternatively, I can use ASP.NET 2.0 MD5 library.

Can someone who is more knowledgable tell me which is the easiest.

All I need to do is, backup my database, compute the MD5 checksum.
Save it to a file, FTP both the file and checksum and the recompute to
validate the file integrity. If there's an error I'll send myself an
email. This needs to be done periodically, once a week.

Apart from referencing the MD5 component I'm confident I can write the
two WMI scripts I need.

I'm inclined to go with the XStandard dll, as I have the example of
how to call their dll - unless someone will recommend a different
route.

.

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