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.NET Framework Security Review by Mark Levison
A great starting point
This book is an excellent starting point for understanding the .NET framework security mechanisms. Especially code access security.
Its only real failings are the lack of depth in a few obscure areas (details around simulating permissions that might be granted to an app deployed via the Internet and hosted in IE).
You could glean most of this information from the internet and spend a month doing it, like I did. Or spend $$$ and few hours reading this well written book.