public ActionResult Edit(CategoryViewModel categoryModel)
{
Category category = categoryModel.category;
if (category == null)
{
throw new ArgumentNullException();
}
ModelState.Remove("category.ID");
if (ModelState.IsValid)
{
_categoriesStorage.EditCategory(category);
}
else
{
RedirectToAction("HttpError500", "Error");
}
return(RedirectToAction("ShowAll"));
}