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"Making code reusable through public class inheritance (PCI) is so convenient and easy that to say it should be avoided may sound a bit heretical. After all, isn't this what OOP is about? And yet that's the position I hold."

"Interfaces are wonderful for a language like C#. Interfaces give us everything we need to work with an object in a strongly-typed manner, but place the least number of constraints on the object implementing the interface. Interfaces make the C# compiler happy without forcing us to pay an inheritance tax for working with a class hierarchy. We'll define an interface that describes exactly how we want to fetch customers and how we want the customers packaged for us to consume."