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The patterns & practices Enterprise Library is a library of Application Blocks designed to assist developers with common enterprise development challenges. Application Blocks are a type of guidance, provided as source code, that can be used as-is, extended or modified by developers for use on enterprise development projects. Enterprise Library features new and updated versions of application blocks that were previously available as stand-alone blocks. All blocks included in Enterprise Library have been updated with a particular focus on consistency, extensibility, ease of use and integration. This release of Enterprise Library includes: Caching Application Block, Configuration Application Block, Cryptography Application Block, Data Access Application Block, Exception Handling Application Block, Logging & Instrumentation Application Block, and Security Application Block.

http://msdn.microsoft.com/library/en-us/dnpag2/html/entlib.asp