I would love it if C# had a predefined method that would be guaranteed to be called after every constructor is done firing. I have some checking code that I need to call, but depending on which constructors are called, it could need to be fired in a few different places. If I had a PostConstructor() method or something, I could centralize the checking code there.

It would also be cool if you could provide a method that would be called before or after every method call, like the SetUp() and TearDown() special methods in NUnit, but without all the reflection overhead at runtime.