private void detach_KHACHHANGs(KHACHHANG entity)
 {
     this.SendPropertyChanging();
     entity.LOAIKHACHHANG = null;
 }
 private void attach_KHACHHANGs(KHACHHANG entity)
 {
     this.SendPropertyChanging();
     entity.LOAIKHACHHANG = this;
 }
 partial void UpdateKHACHHANG(KHACHHANG instance);
 partial void DeleteKHACHHANG(KHACHHANG instance);
 partial void InsertKHACHHANG(KHACHHANG instance);