C# Extension methods in .NET 2.0

Question

I have found several links to methods of making extension methods work in .NET2.0 (The moth, Discord & Rhyme, Stack Overflow). I have also heard vaguely from a colleague

Answer 1

The difference is simple enough:

In your first example, you can put the attribute anywhere. In the second example, you can only apply it to a method, never more than one to the same method and an inherited class with the method overridden will not inherit the attribute. In the third example, you can apply it to a method, a class or an assembly.

If you try to apply it in any other place, you will get a compiler error.

The second seems to make most sense.