MVVM / ObservableCollection Question

Question

I have the following XAML:

Answer 1

As long as the property holding the collection has been created before the list is bound/DataContext set, you should be ok. If the collection is replaced, as @Phil Sandler says, you need to notify. If you create you only perform new when declaring the variable, or inside of the constructor of the class, you should not need notify property changed for that property. If you need to clear the list, I would recommend using the Clear method of the collection, and not replace it.