public ActionResult Create(SalesHistory saleshistory)
        {
            if (ModelState.IsValid)
            {
                db.SalesHistories.Add(saleshistory);
                db.SaveChanges();
                return RedirectToAction("Index");
            }

            ViewBag.Id_Person = new SelectList(db.Persons, "Id_Person", "LastName", saleshistory.Id_Person);
            ViewBag.Id_Vehicle = new SelectList(db.Vehicles, "Id_Vehicle", "Model", saleshistory.Id_Vehicle);
            return View(saleshistory);
        }
 public ActionResult Edit(SalesHistory saleshistory)
 {
     if (ModelState.IsValid)
     {
         db.Entry(saleshistory).State = EntityState.Modified;
         db.SaveChanges();
         return RedirectToAction("Index");
     }
     ViewBag.Id_Person = new SelectList(db.Persons, "Id_Person", "LastName", saleshistory.Id_Person);
     ViewBag.Id_Vehicle = new SelectList(db.Vehicles, "Id_Vehicle", "Model", saleshistory.Id_Vehicle);
     return View(saleshistory);
 }