Microsoft Enterprise Library 4.0

Enterprise Library consists of reusable software components that are designed to assist developers with common enterprise development challenges. It includes a collection of application blocks and a set of core features, such as object generation, configuration, and instrumentation mechanisms. This release of the Enterprise Library includes one new application block, the Unity Application Block, which implements a framework that provides object generation and dependency injection capabilities, plus other new features and enhancements. Please go the link for more information: http://msdn.microsoft.com/en-us/library/cc512464.aspx