//xaml<ListBoxx:Name="lbx"SelectedIndex="0"ItemsSource="{BindingBooksCollection,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"VirtualizingPanel.IsContainerVirtualizable="Tru

publicMainWindow(){InitializeComponent();this.AddHandler(ListBox.SelectionChangedEvent,newSelectionChangedEventHandler(GenericHandler));this.AddHandler(Button.ClickEvent,newRoutedEventHandler(GenericHandler));}