public ActionResult Create(Product product)
        {
            if (ModelState.IsValid)
            {
                productRepository.CreateProduct(product);
                return RedirectToAction("Index");
            }

            return View(product);
        }
 public void DeleteProduct(Product product)
 {
     context.Entry(product).State = EntityState.Deleted;
     context.SaveChanges();
 }
 public void UpdateProduct(Product product)
 {
     context.Entry(product).State = EntityState.Modified;
     context.SaveChanges();
 }
 public void CreateProduct(Product product)
 {
     context.Entry(product).State = EntityState.Added;
     context.SaveChanges();
 }