private void detach_CourseUsers(CourseUser entity)
		{
			this.SendPropertyChanging();
			entity.Course = null;
		}
		private void attach_CourseUsers(CourseUser entity)
		{
			this.SendPropertyChanging();
			entity.Course = this;
		}
 partial void UpdateCourseUser(CourseUser instance);
 partial void DeleteCourseUser(CourseUser instance);
 partial void InsertCourseUser(CourseUser instance);