public void Delete(int competitionId)
        {
            var competitionSport = new CompetitionSport()
            {
                Id = competitionId
            };

            _competitionSports.Attach(competitionSport);
            _competitionSports.Remove(competitionSport);
        }
 public void Add(CompetitionSport presentedSport)
 {
     _competitionSports.Add(presentedSport);
 }
 public void Add(CompetitionSport competitionSport)
 {
     _competitionSports.Add(competitionSport);
 }