public ActionResult Create(DeviceType devicetype)
        {
            if (ModelState.IsValid)
            {
                devicetype.CreateTime = DevTools.GetNowDateTime();
                devicetype.ModifyTime = devicetype.CreateTime;
                db.DeviceTypes.Add(devicetype);
                db.SaveChanges();
                return RedirectToAction("Index");
            }

            return View(devicetype);
        }
 public ActionResult Edit(DeviceType devicetype)
 {
     if (ModelState.IsValid)
     {
         devicetype.ModifyTime = DevTools.GetNowDateTime();
         db.Entry(devicetype).State = EntityState.Modified;
         db.SaveChanges();
         return RedirectToAction("Index");
     }
     return View(devicetype);
 }