WPF and Silverlight offer powerful databinding features. To take advantage of this, your entities are required to implement the INotifyPropertyChanged and INotifyCollectionChanged interfaces. It sounds pretty easy, but there is a catch. By default the collections that NHibernate uses are IDictionary, IList and ISet, none of which implement the INotifyCollectionChanged interface which is needed for databinding to work. There is a way around this limitation.
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