谁能看到为什么？

码：

MysqLConnection myConn = new MysqLConnection(connStr);

string sqlStr = "SELECT CONCAT(Name,' ',score) as NameAndscore " + 
                "FROM highscore ORDER BY score DESC";

MysqLDataAdapter dAdapter = new MysqLDataAdapter(sqlStr,myConn);
DataTable dTable = new DataTable();
dAdapter.Fill(dTable);
dAdapter.Dispose();
lstNames.DisplayMember = "NameAndscore";
lstNames.DataSource = dTable;