The very first talk I gave on .NET was on custom attributes – some time way back in late 2000 or early 2001. At the time I was espousing the benefits of using custom attributes to add on details of unit tests and bug fixes. There have been many additions...

Polymorphism in any OO language is taken as a given – and people would be shouting about it a lot if a language didn’t support it. However, when you’re writing a service interface with WCF you might also want to permit some form of polymorphic behaviour...