This collection class represents the set of selected indexes in a ListBox.

public class ListBox.SelectedIndexCollection : IList, ICollection, IEnumerable {
// Public Constructors
   public ListBox.SelectedIndexCollection(ListBox owner);
// Public Instance Properties
   public int Count{get; }
// implements ICollection
   public bool IsReadOnly{get; }
// implements IList
   public int this{get; }
// Public Instance Methods
   public bool Contains(int selectedIndex);
   public void CopyTo(Array dest, int index);  // implements ICollection
   public IEnumerator GetEnumerator();  // implements IEnumerable
   public int IndexOf(int selectedIndex);
}