NotifyCollectionChangedEventHandler public sealed delegate NotifyCollectionChangedEventHandler : MulticastDelegate Represents the method that handles the CollectionChanged event. Documentation public NotifyCollectionChangedEventHandler(object object, IntPtr method) public virtual IAsyncResult BeginInvoke(object sender, NotifyCollectionChangedEventArgs e, AsyncCallback callback, object object) public virtual void EndInvoke(IAsyncResult result) public virtual void Invoke(object sender, NotifyCollectionChangedEventArgs e)