partial void DeleteTopic(Topic instance);
 partial void UpdateTopic(Topic instance);
		private void detach_Topics(Topic entity)
		{
			this.SendPropertyChanging();
			entity.Course = null;
		}
 partial void InsertTopic(Topic instance);
		private void attach_Topics(Topic entity)
		{
			this.SendPropertyChanging();
			entity.Course = this;
		}