private void detach_DangKyHocs(DangKyHoc entity)
 {
     this.SendPropertyChanging();
     entity.SinhVien = null;
 }
 private void attach_DangKyHocs(DangKyHoc entity)
 {
     this.SendPropertyChanging();
     entity.MonHoc = this;
 }
 partial void UpdateDangKyHoc(DangKyHoc instance);
 partial void DeleteDangKyHoc(DangKyHoc instance);
 partial void InsertDangKyHoc(DangKyHoc instance);