I don't see why you just didn't stick with ObservableCollection. It's concurrent for read only. You simply "subscribe / unsubscribe". As if you can predict what properties to refresh on the client side. "Before entering on an understanding, I have meditated for a long time, and have foreseen what might happen. It is not genius which reveals to me suddenly, secretly, what I have to say or to do in a circumstance unexpected by other people; it is reflection, it is meditation." - Napoleon I