public bool KiemTraDangNhap(string tenDangNhap, string matKhau) { NguoiDungDAO itemDAO = new NguoiDungDAO(); NguoiDungDTO nguoiDungDTO = itemDAO.KiemTraDangNhap(tenDangNhap, matKhau); if (nguoiDungDTO.Id > 0) { if (nguoiDungDTO.VoHieu == true) { return(true); } else { KiemTraThoiGian iThoiGian = new KiemTraThoiGian(); return(iThoiGian.KiemTraKhoangThoiGianDMY(nguoiDungDTO.NgayBatDau, nguoiDungDTO.NgayKetThuc)); } } else { return(false); } }