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The ContactList is a list of Contact objects. Only objects existing in the owning ContactCollection object may be added to this list. Use the ContactList to associate the set of Contact objects with an Appointment object.
public class ContactList : BaseList<Contact>, IList<Contact>, ICollection<Contact>, IList, ICollection, IReadOnlyList<Contact>, IReadOnlyCollection<Contact>, IEnumerable<Contact>, IEnumerable, INotifyCollectionChanged