public ActionResult Edit(int? id)
{
    if (id == null)
    {
            return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
        }
        Product product = db.Product.Find(id);
        if (product == null)
        {
            return HttpNotFound();
        }
        return View(product);
}
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Edit([Bind(Include = "Id,Name,Comment,Last_edited")] Product product)
{
    if (ModelState.IsValid)
    {
        db.Entry(product).State = EntityState.Modified;
                db.SaveChanges();
                return RedirectToAction("Index");
    }
        return View(product);
}

[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Edit([Bind(Include = "Id,Name,Comment")] Product product)
{
     product.Last_Edited = DateTime.UtcNow;
    if (ModelState.IsValid)
    {

        db.Entry(product).State = EntityState.Modified;
                db.SaveChanges();
                return RedirectToAction("Index");
    }
        return View(product);
}