public void Save()
        {
            ChampionXmlData championXmlData = new ChampionXmlData();

            using (championXmlData)
            {
                championXmlData.Write(_champions);
            }
        }
        public ChampionRepository()
        {
            ChampionXmlData championXmlData = new ChampionXmlData();

            using (championXmlData)
            {
                _champions = championXmlData.Read() as List <Champion>;
            }
        }