public IEnumerable<UrlAd> GetUniqueIds(IEnumerable<UrlAd> urlAds)
        {
            IEnumerable<UrlAd> result=null;
            if (urlAds != null && urlAds.Count() > 0)
            {
                 using (var db = context.GetContext())
                {
                    var entity = db.Set<UrlAd>();
                   
                    result = urlAds.Where(x =>! entity.Any(w => x.BoardId == w.BoardId && x.InnerId == w.InnerId)).ToList();
                }
            }
           return result;
        }