仿照http://blog.csdn.net/makenothing/article/details/17080069

1 建立Oracle连接 VS2010中加入数据库连接

得到连接字符串

Data Source=server1;Persist Security Info=True;User ID=s227;Password=×××;Unicode=True   ×××为你的password

2 建立VS2010 C#控制台程序

由于这个是演示样例程序 控制台比較方便

在引用中加入 System.Data.OracleClient 引用(Framwork 4.0之下有这个引用) 详细能够看下我开头给出的网址 里面有差错的程序

然后 using System.Data.OracleClient

3 演示样例程序 走起

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.OracleClient;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string connString = "Data Source=server1;Persist Security Info=True;User ID=s227;Password=123;Unicode=True";
            string queryString = "SELECT * FROM PRODUCT ";
            OracleConnection conn = new OracleConnection(connString);
            conn.Open();
            OracleCommand command = new OracleCommand(queryString,conn);
            OracleDataReader reader = command.ExecuteReader();
            reader.Read();
            Console.WriteLine("1 "+reader["MAKER"]+" 2 "+reader["MODEL"]+" 3 "+reader["TYPE"]);
            reader.Close();
            conn.Close();

            /*
             * //学习的代码块
            string connectionString;
            string queryString;

            connectionString = "Data Source=202.200.136.125/orcl;User ID=openlab;PassWord=open123";

            queryString = "SELECT * FROM T_USER";

            OracleConnection myConnection = new OracleConnection(connectionString);

            OracleCommand myORACCommand = myConnection.CreateCommand();

            myORACCommand.CommandText = queryString;

            myConnection.Open();

            OracleDataReader myDataReader = myORACCommand.ExecuteReader();

            myDataReader.Read();

            Console.WriteLine("email: " + myDataReader["EMAIL"]);

            myDataReader.Close();

            myConnection.Close();
            */


        }
    }
}

输出 1 A  2 1001 3 PC

这个输出与你的queryString

也就是查询语句有关系