One reason a developer would use a technology like MEF is to, as the name implies, make an application extensible through a process called discovery. Discovery is simply a method for locating classes, types, or other resources in an assembly. MEF uses the Export tag to flag items for discovery, and the composition process then aggregates those ...

PRISM, also known as Composite WPF, has established itself as a very popular framework for building modular, scalable Silverlight applications. A newer contender, the Managed Extensibility Framework (MEF), has also grown in popularity. In fact, these two frameworks have left people scratching their heads wondering which one to use, when, how, and ...

For all of the Prism fans out there, a newer version has been released. You can download it here.

Thanks to those of you who read my Twist on the Observer pattern and gave me the feedback. You said, ''Hey, Jeremy, that's neat, but there is already a pattern established for what you're talking about, and a few great solutions ready to use. Besides, they are much, much more powerful...'' Thanks to Microsoft MVP Jason Rainwater for taking the ...

The observer pattern is well established and used. The typical scenario is to register to an class and then allow your Notify method to be called. This often involves keeping an internal list of observers and then iterating them to notify that something has changed. I had a situation recently that warranted a lighter weight approach that allows a ...