Fechar Conexao MySQL

public MySqlDataReader PontosTotalAberto()
    {
        MySqlConnection CN = new MySqlConnection(Con);
        MySqlCommand CMD = new MySqlCommand("SELECT COUNT(codpon)TOTAL FROM pontos,funcionarios WHERE funcionarios.CODFUN=pontos.CODFUN AND funcionarios.CODEMP=pontos.CODEMP AND pontos.CODEMP=2 AND STACOL=0 AND DTAPON < NOW()", CN);
        MySqlDataReader DR;

        try
        {
            CN.Open();
            int regitrosAfetados = CMD.ExecuteNonQuery();
            DR = CMD.ExecuteReader();
            return DR;
        }
        catch (MySqlException ex)
        {
            throw new ApplicationException(ex.ToString());
        }
        finally
        {

        }
    }

            PontosSQL PontosSQL = new PontosSQL();
            MySqlDataReader RTotal = PontosSQL.PontosTotalAberto();
            while (RTotal.Read())
            {
                LBAnteriores.Text = RTotal["TOTAL"].ToString();
            }
            RTotal.Dispose();