I got this sample http://jfromaniello.blogspot.com/2010/04/event-aggregator-with-reactive.html,
Which describe event aggregator pattern using .net 4.0 but i didn't find in the sample code the ISubject interface and the Subject class and i found the he is using them in the EventAggregator class, is it right to use them like that and what will their code will look like?