partial void DeleteSemester_Year(Semester_Year instance);
 partial void UpdateSemester_Year(Semester_Year instance);
		private void detach_Semester_Years(Semester_Year entity)
		{
			this.SendPropertyChanging();
			entity.Semester = null;
		}
 partial void InsertSemester_Year(Semester_Year instance);
		private void attach_Semester_Years(Semester_Year entity)
		{
			this.SendPropertyChanging();
			entity.Semester = this;
		}