public ActionResult Create(SemiAcousticGuitar semiacousticguitar)
        {
            if (ModelState.IsValid)
            {
                db.Guitars.Add(semiacousticguitar);
                db.SaveChanges();
                return RedirectToAction("Index");
            }

            FillSemiAcousticGuitarViewBag(semiacousticguitar);
            return View(semiacousticguitar);
        }
 public ActionResult Edit(SemiAcousticGuitar semiacousticguitar)
 {
     if (ModelState.IsValid)
     {
         db.Entry(semiacousticguitar).State = EntityState.Modified;
         db.SaveChanges();
         return RedirectToAction("Index");
     }
     FillSemiAcousticGuitarViewBag(semiacousticguitar);
     return View(semiacousticguitar);
 }
        private void FillSemiAcousticGuitarViewBag(SemiAcousticGuitar g)
        {
            FillAcousticGuitarViewBag(g);

            ViewBag.PreampId = new SelectList(db.Preamps, "Id", "Name", g.PreampId);
            ViewBag.PickupId = new SelectList(db.Pickups, "Id", "Name", g.PickupId);
        }