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  • No, it's not the only safe way. There is another safer way. That is the extension methods. Clients will not be infected at all. That's why I have mentioned interfaces + extension methods. Commented Jan 31, 2011 at 11:36
  • @Ed James I think "less powerful" = "more flexible" When would you choose a more powerful abstract class instead of more flexible interface? Commented Jan 31, 2011 at 12:26
  • @Ed James In asp.mvc extension methods were used from the very beginning. What do you think about that? Commented Feb 23, 2011 at 11:08