public static LoaiSanPhamDTO LayThongTinLoaiSanPham(string maLoaiSP) { if (LoaiSanPhamDAO.KTMaLoaiSPTonTai(maLoaiSP)) { return(LoaiSanPhamDAO.LayThongTinLoaiSanPham(maLoaiSP)); } else { return(null); } }