private void PopulateConcertList()
        {
            ConcertList.Clear();
            List <Concert> temp = QueryManager.GetConcert("");

            for (int i = 0; i < temp.Count; i++)
            {
                ConcertList.Add(temp[i]);
            }
        }
 public void CreateConcert(Concert concert)
 {
     concert.ConcertId = QueryManager.CreateConcert(ref concert);
     ConcertList.Add(concert);
 }