partial void DeletePartVideo(PartVideo instance);
 partial void UpdatePartVideo(PartVideo instance);
		private void detach_PartVideos(PartVideo entity)
		{
			this.SendPropertyChanging();
			entity.videoType = null;
		}
 partial void InsertPartVideo(PartVideo instance);
		private void attach_PartVideos(PartVideo entity)
		{
			this.SendPropertyChanging();
			entity.Part = this;
		}