Wpf mvvm listview not updating

The item is deleted from the collection but the List View is not reflecting it.The app has to be restarted to see that the item is deleted.

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In WPF, you can associate a data template with a view model type at the application level.WPF will then automatically apply the data template to any view model objects of the specified type whenever they are displayed in the UI. The data template can be defined in-line with the control that uses it or in a resource dictionary outside the parent view and declaratively merged into the view's resource dictionary.The following sections describe the responsibilities and characteristics of each of the classes in the MVVM pattern.The view's responsibility is to define the structure and appearance of what the user sees on the screen.The MVVM pattern is a close variant of the Presentation Model pattern, optimized to leverage some of the core capabilities of WPF , such as data binding, data templates, commands, and behaviors.

In the MVVM pattern, the view encapsulates the UI and any UI logic, the view model encapsulates presentation logic and state, and the model encapsulates business logic and data.In WPF, data binding expressions in the view are evaluated against its data context.In MVVM, the view's data context is set to the view model.This topic provides an overview of the MVVM pattern and describes how to implement its fundamental characteristics.The topic Advanced MVVM Scenarios describes how to implement more advanced MVVM scenarios using the Prism Library.Using the MVVM pattern, the UI of the application and the underlying presentation and business logic is separated into three separate classes: the view, which encapsulates the UI and UI logic; the view model, which encapsulates presentation logic and state; and the model, which encapsulates the application's business logic and data.