Code access security is one area that has changed quite significantly between .NET 3.5 and .NET 4.0. Once an assembly has been upgraded, if it allowed partially-trusted callers under .NET 3.5, it would throw exceptions when called under .NET 4.0. In order to make such assemblies continue to function after being upgraded, AssemblyInfo.cs needs to change from this:
[assembly: AllowPartiallyTrustedCallers]
to this:
[assembly: AllowPartiallyTrustedCallers]
[assembly: SecurityRules(SecurityRuleSet.Level1)]
Once this change has been made, the assembly will work under the same code access security rules that applied prior to .NET 4.0.
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