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