public async Task<ActionResult> Redigera(ProductCategory productCategory)
 {
     if (ModelState.IsValid)
     {
         db.Entry(productCategory).State = EntityState.Modified;
         await db.SaveChangesAsync();
         return RedirectToAction("Index");
     }
     return View(productCategory);
 }
        public async Task<ActionResult> Skapa(ProductCategory productCategory)
        {
            if (ModelState.IsValid)
            {
                productCategory.CreatedOn = DateTime.Now;
                db.ProductCategories.Add(productCategory);
                await db.SaveChangesAsync();
                return RedirectToAction("Index");
            }

            return View(productCategory);
        }