public async Task<IActionResult> Edit(int id)
        {
            var product = await this.productService.GetProductAsync(id);
            if (product == null) return NotFound();

            var model = mapper.MapFrom(product);
            model = await EditDropdown(model);

            return View(model);
        }

        [HttpPost]
        [ValidateAntiForgeryToken]
        public async Task<IActionResult> Edit(int id, ProductViewModel product)
        {
            if (!this.ModelState.IsValid)
            {
                product = await EditDropdown(product);
                return View(product);
            }

            try
            {
                if (product.ProductImage != null)
                    {
                        if (!IsValidImage(product.ProductImage))
                        {
                            StatusMessage = "Error: Please provide a .jpg or .png file smaller than 2MB";
                            return View(product);
                        }

                        product.ImageName = await productService.UploadProductImageAsync(
                        GetUploadsRoot(),
                        product.ProductImage.FileName,
                        product.ProductImage);
                    }

                    if (id != product.ProductId) return NotFound();

                    var newProduct = product.ToEntity();
                    await productService.UpdateProductAsync(newProduct);

                    StatusMessage = $"Successfully modified \"{product.ProductName}\"";
                    return RedirectToAction(nameof(Index));
            }
            catch (DbUpdateConcurrencyException)
            {
                if (await productService.ExistsInDBAsync(product.ProductName) == false)
                    return NotFound();
                throw;
            }
        }