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