The Single Responsability Principle is one of the five S.O.L.I.D. principles in which i base my everyday programming. It tells us how a method or class should have only one responsability. Not a long time ago i was designing a reporting service with my colleague Nuno for an application module we were redoing and we had a method that was responsible for being both the factory method of a popup view and showing it to the user. You can see where this is going now... I figured out it would not be a that bad violation of the principle, so we moved on with this design. The method was called something like "ShowPrintPopup" and it took an IReport as an argument. All this was fine, but then we got to a point where we needed to have a permissions system to say if the user was able to export the report to Excel, Word, PDF, etc... The problem was the print popup would need to know beforehand if it would allow the user to export the report or not, so that it could show it's UI a
Let's have some fun with programming...