public void AddWishList(int userid, int bookid)
        {
            WATCHLIST watchlist = new WATCHLIST();

            watchlist.BOOKID = bookid;
            watchlist.USERID = userid;
            dataAccess.WATCHLISTs.InsertOnSubmit(watchlist);
            dataAccess.SaveChanges();
        }
        public void DeleteWishList(int id)
        {
            WATCHLIST watchList = dataAccess.WATCHLISTs.Single(wl => wl.WATCHLISTID == id);

            if (watchList != null)
            {
                dataAccess.WATCHLISTs.DeleteOnSubmit(watchList);
            }
            dataAccess.SaveChanges();
        }