Using Xamarin Forms and a Listview, demonstrating various way to select and unselect items from the listview. (via code or user interaction)
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https://developer.xamarin.com/guides/xamarin-forms/user-interface/listview/
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https://developer.xamarin.com/api/type/Xamarin.Forms.ListView/
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https://developer.xamarin.com/samples/xamarin-forms/UserInterface/ListView/interactivity/
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https://github.com/xamarin/xamarin-forms-samples/tree/master/UserInterface/ListView/Interactivity