This collection class represents the set of indexes of the checked items in the ListView.

public class ListView.CheckedIndexCollection : IList, ICollection, IEnumerable {
// Public Constructors
   public ListView.CheckedIndexCollection(ListView 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 checkedIndex);
   public IEnumerator GetEnumerator();  // implements IEnumerable
   public int IndexOf(int checkedIndex);
}