public Phong_WCF() { db = new DB_KhachSanDataContext(); }
public KhachHang_WCF() { db = new DB_KhachSanDataContext(); }
public DichVu_WCF() { db = new DB_KhachSanDataContext(); }
public NhanVien_WCF() { db = new DB_KhachSanDataContext(); }