// GET: INV_ItemConfiguration
        public ActionResult Index()
        {
            var iNV_ItemConfiguration = db.INV_ItemConfiguration.GroupBy(IC => IC.MainItemID)
                                        .Select(IC => IC.FirstOrDefault()).Include(i => i.INV_Item).Include(i => i.SEC_User).ToList();

            //var iNV_ItemConfiguration = db.INV_ItemConfiguration.Distinct(i=>i.MainItemID).Include(i => i.INV_Item).Include(i => i.SEC_User);
            return(View(iNV_ItemConfiguration));
        }