public void xoa1quyenchonhomnd(string mand, string maquyen)
 {
     using (QLBanHangDataContext data = new QLBanHangDataContext())
     {
         Phanquyennhom pq = new Phanquyennhom();
         pq = data.Phanquyennhoms.Where(t => t.Maquyen == maquyen).FirstOrDefault();
         if (pq != null)
         {
             data.Phanquyennhoms.DeleteOnSubmit(pq);
             data.SubmitChanges();
         }
     }
 }
        public void them1quyenchonhomnd(string Mand, string maquyen, bool quyen)
        {
            using (QLBanHangDataContext data = new QLBanHangDataContext())
            {
                Phanquyennhom pq = new Phanquyennhom();
                pq.Manhomnguoidung = Mand;
                pq.Maquyen         = maquyen;
                pq.Quyenhan        = quyen;

                data.Phanquyennhoms.InsertOnSubmit(pq);
                data.SubmitChanges();
            }
        }