public IPHONE Save(IPHONE iPHONE)
        {
            if (iPHONE.PRODUCT_ID == 0)
            {
                db.IPHONEs.Add(iPHONE);
            }
            else
            {
                db.Entry(iPHONE).State = EntityState.Modified;
            }
            db.SaveChanges();

            return(iPHONE);
        }
 public void Delete(IPHONE iPHONE)
 {
     db.IPHONEs.Remove(iPHONE);
     db.SaveChanges();
 }