<p>The Managed Extensibility Framework (MEF) is one of the coolest and most exciting new features of .NET Framework 4. It allows application developers to discover and use extensions at runtime with no configuration files required. MEF also lets extension developers easily encapsulate code and avoid fragile, hard dependencies resulting in more modular and maintainable/testable applications.</p> <p>This demo-rich session will teach you exactly what MEF is, how simple it is to use, give you a few tricks for getting the most out of it while avoiding common pitfalls and introduce you to pre-existing frameworks that make creating MEF based applications a breeze. You will also learn several specific - and surprisingly simple - methods for retrofitting your existing code to harness the powers of MEF.</p>