Expose a Cars property:
public IEnumerable Cars { get { return _dictionary.Values; } }
// can be shorted to
// public IEnumerable Cars => _dictionary.Values;
// if you like being modern.
(This assumes:
private Dictionary _dictionary;
) Bind parkingLot.Cars to your listbox. Make sure Vehicle has a ToString() which renders it as you want it to appear in the listbox.
Truth, James
