co-worker question: what is better, extension methods or helper classes?

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Recently, a co-worker at a client asked me “What is better: extension methods of helper classses?”. This question is relevant not only in the .NET and Delphi worlds. My answer was simple, consisting of these 3 points: If you can extend your class hierarchy in a better way, then do it If ...http://feeds.feedburner.com/~r/delph...~4/TWaM86j1aks

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