PropertyChangingEventHandler public sealed delegate PropertyChangingEventHandler : MulticastDelegate Delegate for the PropertyChanging event. Documentation Code public PropertyChangingEventHandler(object object, IntPtr method) public virtual IAsyncResult BeginInvoke(object sender, PropertyChangingEventArgs e, AsyncCallback callback, object object) public virtual void EndInvoke(IAsyncResult result) public virtual void Invoke(object sender, PropertyChangingEventArgs e)