//Xoa public static bool XoaTyGia(string ma) { return(DL_TyGia.TyGiaXoa(ma)); }
//them public static bool ThemTyGia(string ma, string ten, string quydoi) { return(DL_TyGia.TyGiaThem(ma, ten, quydoi)); }
//sua public static bool SuaTyGia(string ma, string ten, string quydoi) { return(DL_TyGia.TyGiaSua(ma, ten, quydoi)); }
public static DataTable LayDuLieuTyGia() { return(DL_TyGia.DuLieuTyGia()); }