OracleConnection myConnection = new OracleConnection(connectionString);//创建新的OracleDataAdapter对象
            OracleCommand myORACCommand = myConnection.CreateCommand();
             = queryString;
            myConnection.Open();
            OracleDataAdapter oraDA = new OracleDataAdapter(myORACCommand);
            DataSet ds = new DataSet();
            oraDA.Fill(ds); myConnection.Close();
            DataTable dtbl = ds.Tables[0];
            this.dataGridView1.DataSource = dtbl;
能注释下吗？