private void ContactManagerWindow_Loaded(object sender, RoutedEventArgs e)
{
contacts = ContactHandler.LoadContacts();
ContactListBox.ItemsSource = contacts;
CollectionView view = (CollectionView)CollectionViewSource.GetDefaultView(ContactListBox.ItemsSource);
view.Filter = ContactFilter;
ContactListBox.SelectedIndex = 0;
CreditsWindow credits = new CreditsWindow();
credits.Show();
}
private void EditWindow_Closed(object sender, EventArgs e) => ContactListBox.ItemsSource = ContactHandler.LoadContacts();