At Microsoft PDC 2009 I gave a talk entitled “Developing Testable Silverlight Applications”. We looked at how to use the Inversion of Control principle with the Model-View-ViewModel design pattern to isolate the dependencies within a Silverlight 4 application for easier testing. We also saw how to improve testability by taking advantage of the natural boundaries in Silverlight applications utilizing WCF RIA Services to query for data and persist units of work. There was so much material to cover during my session that I am going use a series of blog posts to provide more in-depth detail on the techniques I talked about....