This collection class is used to specify the list of checked indexes
in the CheckedListBox control.
public class CheckedListBox.CheckedIndexCollection : IList, ICollection, IEnumerable {
// 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 index);
public void CopyTo(Array dest, int index); // implements ICollection
public IEnumerator GetEnumerator(); // implements IEnumerable
public int IndexOf(int index);
}