我新建了一个Acess数据库(.mdb),里面建了一张表,有ID,甲,乙,丙,丁几个列。。我想通过C#一个循环读取这几个列中的数字。我是这样做的,可是接下去该怎么写呢???菜鸟真心求指导!!!
string strConnection = "Provider=Microsoft.Jet.OleDb.4.0;";
            strConnection += @"Data Source=E:\Calculation\DBtest.mdb";
            OleDbConnection objConnection = new OleDbConnection(strConnection);
            objConnection.Open();                                                     //至此连接数据库完毕            string str_Sql = "SELECT * FROM [main] WHERE ID=";
            string l = str_Sql + index.ToString();
            OleDbCommand command = new OleDbCommand(l, objConnection);
            OleDbDataReader reader = command.ExecuteReader();            while (reader.Read())
            {
                for (int n = 0; n <= 3; n++)
                {
                    
                }
            } 
就是循环中该怎样写?