public async Task <IActionResult> UpdateProductPrice(CustomerModel.ProductPriceModel model)
        {
            await _customerViewModelService.UpdateProductPrice(model);

            return(new NullJsonResult());
        }
 public IActionResult UpdateProductPrice(CustomerModel.ProductPriceModel model)
 {
     _customerViewModelService.UpdateProductPrice(model);
     return(new NullJsonResult());
 }