private void detach_ExamTBs(ExamTB entity)
 {
     this.SendPropertyChanging();
     entity.Student = null;
 }
 private void attach_ExamTBs(ExamTB entity)
 {
     this.SendPropertyChanging();
     entity.Student = this;
 }
 partial void UpdateExamTB(ExamTB instance);
 partial void DeleteExamTB(ExamTB instance);
 partial void InsertExamTB(ExamTB instance);