I’m using Prism in WPF.
I was watching the Prism starter kit, and it has a ICollectionView. In that collection, I need to add the object selected in it. What object (or collection) should I use to add objects?

I mean in the image, I have two listbox, in the first one I’ve got a readonly collection and the second one is a list where can add or remove objects.
Your List should be bound to an ICollectionView that wraps an ObservableCollection. When you add, you add to this Observable collection.
I.e
Constructor
Where List2 is what is bound to