public static void deleteLoaiHang(int malh)
 {
     LoaiHang_DAO.XoaLoaiHang(malh);
 }
 public static void updateLoaiHang(LoaiHang lh)
 {
     LoaiHang_DAO.SuaLoaiHang(lh);
 }
 public static DataSet getLoaiHang()
 {
     return(LoaiHang_DAO.getLoaiHang());
 }
 public static void addLoaiHang(LoaiHang lh)
 {
     LoaiHang_DAO.ThemLoaiHang(lh);
 }
 public static DataTable loadLoaiHang()
 {
     return(LoaiHang_DAO.loadLoaiHang());
 }