Here is the seventh (OMG !) post on the WPF 4.5 new features. Collections are a part of every application and their management is maybe the first thing you learn to deal with in WPF. To begin, you put everything on the main(the UI one) thread and it works just fine. After a few time, you realize that it freezes the application UI and that the users usually don’t like it. Then you put the collections creation/feeding on another Thread to free the UI’s one and you realize that it is not possible because : “This type of CollectionView does not support changes to its SourceCollection from a thread different from the Dispatcher thread”. In this post we will discover that this is over with WPF 4.5 (and that you’ll love it) !