Comment the interface, implementation or both?

Question

I imagine that we all (when we can be bothered!) comment our interfaces. e.g.

/// 

/// Foo Interface
/// 
public interface Fo         


        

Answer 1

You can certainly comment both but then you have the problem of maintaining both (as previously mentioned). However, in this day and age is any consuming code really not going to be using IoC/DI and not use the interface? Given this if you only want to bother commenting one I would strongly suggest commenting the interface. This way the consumer of your code will more than likely get the nice intellisense hints.