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I think this article explains it:

https://msdn.microsoft.com/en-us/library/ms173153.aspx

basically it depends on whether your beverage is being accessed as a Mocha or and Expresso vs what it actually is.

ie

((Espresso)mocha).GetDescription() == "espresso" if you 'new' rather than 'override'

so if you want to do

foreach(Beverage b in List) { //print description } 

then you should overide