public IActionResult GetCustomerListBySearchingString(string searchString, int pageNumber, int pageSize)
        {
            var customerList = _customerDataService.GetCustomerByQueryString(searchString, pageNumber, pageSize, out var total);

            if (customerList != null && customerList.Count > 0)
            {
                return(Json(new { data = customerList, total = total }));
            }

            return(BadRequest("Error in fetching customer list."));
        }