You are interested in learning Reactive Extensions(http://rx.codeplex.com/)? But you don’t know where to start or you don’t see a practical use case?
Have a look at the ReactiveTrader application created by the guys from Adaptive.
From the site:
Reactive Trader is a client-server application demonstrating some of the problems needing to be dealt with when building reactive, or event driven, user interfaces. It was initially built as a demonstration application for a presentation we gave at ReactConf 2014.
What makes this example really nice is the fact that it exists for multiple platforms like HTML5, iOS, WPF,…