partial void DeleteCourse(Course instance);
 partial void UpdateCourse(Course instance);
		private void detach_Courses(Course entity)
		{
			this.SendPropertyChanging();
			entity.Professor = null;
		}
 partial void InsertCourse(Course instance);
		private void attach_Courses(Course entity)
		{
			this.SendPropertyChanging();
			entity.Professor = this;
		}