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When the datalist is refreshed it is filled up with the same objects as before.

If these objects do not implement notification on property changes the list Box does not update its view, no matter if the objects are re-inserted or not.

The problem is that none of the buttons seems to work. The first step is to get the UI to respond to changes in the list source (Items Source), like when we add or delete a user.

For example, you can instantiate the collection in XAML and specify the collection as a resource, as shown here: The objects in your collection must satisfy the requirements described in the Binding Sources Overview.As and when the User object is created it is added to the Observable Collection and On Property Changed is called to notify the UI elements to refresh. When user selects to view Favorites only, one User item from view is removed.Checking & Unchecking the checkbox has the same effect...So far in this tutorial, we have mostly created bindings between UI elements and existing classes, but in real life applications, you will obviously be binding to your own data objects.This is just as easy, but once you start doing it, you might discover something that disappoints you: Changes are not automatically reflected, like they were in previous examples.In the previous example, the only thing to change to make the collection modifiable across threads is the instantiation of the collection in the View Model : to raise the event when the collection is modified from the main thread can cause unpredictable behavior.