public IHttpActionResult DatPhongThuNghiem([FromBody] dynamic dynamic)
        {
            if (dynamic == null)
            {
                return(BadRequest());
            }
            List <KhachHangDTO> lstKhachHang = JsonConvert.DeserializeObject <List <KhachHangDTO> >(dynamic.ToString());

            using (NhanVienBusiness nhanVienBusiness = new NhanVienBusiness())
            {
                string result = nhanVienBusiness.DatPhongThuNghiem(lstKhachHang);
                if (result.Equals("ok"))
                {
                    return(Ok(result));
                }
                else
                {
                    return(BadRequest(result));
                }
            }
        }