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What is Dependency Injection? The answers to the question seem to cause more confusion than help. We'll take a look at what Dependency Injection (DI) is, when we should use it, and what design patterns we can use to help us implement it. Benefits range from extensibility to late binding to testability. We can implement DI with or without a container (such as Unity, Ninject, or StructureMap), but we'll see how a container can do a lot of the work for us.