public void FetchTracks() { Tracks.Clear(); string query = "select * from Spoor"; OracleDataReader dbr = DBManager.ExecuteQuery(query); if (!dbr.HasRows) { return; } else while (dbr.Read()) { Track track = new Track(Convert.ToInt32(dbr["ID"].ToString()), Convert.ToInt32(dbr["Nummer"].ToString())); track.LinkSectors(FetchSectors(track)); Tracks.Add(track); } }