David DeWinter has an excellent series of post on different topics security in both CLR 2.0 and CLR 4.0
Transparency Can Reduce Your Security Footprint – #1
Using Transparency in CLR 2.0 – #2
Transparent Code Behavior in CLR 2.0 – #3
What’s New With Security in .NET 4? – #4
Opting Out of Security Changes in .NET 4 – #5
The AllowPartiallyTrustedCallersAttribute (APTCA) – #6
How to Host a Partial Trust Sandbox – #7
Conditional APTCA in .NET 4 – #8
Hosting Conditional APTCA Assemblies – #9
An Introduction to Security Transparency in .NET 4 – #10
Type Transparency in .NET 4 – #11
Partial Trust, APTCA, and Security Transparency – #12
Transparency and Implicit Static Constructors – #13
Determining the Security Rules for Your Assemblies – #14
The SecurityRulesAttribute – #15
Mixing Level 1 and Level 2 Transparency Rules – #16
How to Build APIs with Transparency in Mind – #17
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