public async Task <IActionResult> OnPostAddProductAsync(ProductDto dto)
        {
            if (!ModelState.IsValid)
            {
                ViewData["productError"] = "Fill all fields";
                return(Page());
            }
            Product product = _mapper.Map <Product>(dto);

            if (dto.File != null)
            {
                string path = "/images/product/" + dto.File.FileName;
                using (var stream = new FileStream(_env.WebRootPath + path, FileMode.OpenOrCreate))
                {
                    await dto.File.CopyToAsync(stream);
                }
                product.ImageFile = dto.File.FileName;
            }
            else
            {
                product.ImageFile = "https://piotrkowalski.pw/assets/camaleon_cms/image-not-found-4a963b95bf081c3ea02923dceaeb3f8085e1a654fc54840aac61a57a60903fef.png";
            }
            await _productApi.CreateProduct(product);

            return(RedirectToPage("Index"));
        }