This collection class is used to specify the list of checked items in
the CheckedListBox control.
public class CheckedListBox.CheckedItemCollection : IList, ICollection, IEnumerable {
// Public Instance Properties
public int Count{get; }
// implements ICollection
public bool IsReadOnly{get; }
// implements IList
public object this{set; get; }
// implements IList
// Public Instance Methods
public bool Contains(object item); // implements IList
public void CopyTo(Array dest, int index); // implements ICollection
public IEnumerator GetEnumerator(); // implements IEnumerable
public int IndexOf(object item); // implements IList
}