Inversion of Control or IoC is very simply put a pattern defined by Martin Fowler for injecting a class's dependencies. IoC helps with mocking objects and thus a dependency of a object. It helps improve testability of a object because of the easy of mock object injections. Java and .NET have a good collection of OSS frameworks for IoC, Spring is quite popular in the Java world and Spring.Net in the .NET world. There is quite a lot of XML configuration to Spring and a alternative and popular choice in the ..NET world is Castle MicroKernel . The documentation is top notch for learning how to use this framework with a work through guide , well worth a look. Read More...