Signing a file, crypto checksum

From: Herbert (anonymous_at_discussions.microsoft.com)
Date: 02/19/04 

Date: Thu, 19 Feb 2004 13:36:10 -0800

I need to create a crypto checksum (Hash) to dedect modifications to a file.
1. Where can I / should I store the hash value in the file(header)?
2. How can I access this location using .NET classes?

thank you, herbert

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