public List <taiKhoan> getAllAcc()
        {
            QLCHDoChoiEntities dbAcc = new QLCHDoChoiEntities();
            var listAcc = dbAcc.taiKhoans.ToList();

            return(listAcc);
        }
        public List <HoaDon> getAllConsumeP()
        {
            QLCHDoChoiEntities dbConsP = new QLCHDoChoiEntities();
            var listConsP = dbConsP.HoaDons.ToList();

            return(listConsP);
        }
        public List <khachHang> getAllKhachHang()
        {
            QLCHDoChoiEntities dbKhachHang = new QLCHDoChoiEntities();
            var listKH = dbKhachHang.khachHangs.ToList();

            return(listKH);
        }
        public List <doChoi> getAllDC()
        {
            QLCHDoChoiEntities dbDC = new QLCHDoChoiEntities();
            var listDC = dbDC.doChois.ToList();

            return(listDC);
        }
        public List <nhanVien> getAllNhanVien()
        {
            QLCHDoChoiEntities dbNhanVien = new QLCHDoChoiEntities();
            var listNhanVien = dbNhanVien.nhanViens.ToList();

            return(listNhanVien);
        }