public ActionResult Create(ProductSpec productspec)
        {
            if (ModelState.IsValid)
            {
                db.ProductSpecs.Add(productspec);
                db.SaveChanges();
                return RedirectToAction("Index");
            }

            ViewBag.ProductID = new SelectList(db.Product, "ProductID", "ProductName", productspec.ProductID);
            ViewBag.SpecificationID = new SelectList(db.Specification, "SpecificationID", "SpecName", productspec.SpecificationID);
            return View(productspec);
        }
 public ActionResult Edit(ProductSpec productspec)
 {
     if (ModelState.IsValid)
     {
         db.Entry(productspec).State = EntityState.Modified;
         db.SaveChanges();
         return RedirectToAction("Index");
     }
     ViewBag.ProductID = new SelectList(db.Product, "ProductID", "ProductName", productspec.ProductID);
     ViewBag.SpecificationID = new SelectList(db.Specification, "SpecificationID", "SpecName", productspec.SpecificationID);
     return View(productspec);
 }