c#连接access数据库

using System;
using System.Data;
using System.Data.OleDb;
/**
 * @author Donie
 */
namespace mono_csharp
{
    class MainClass
    {
        public static void Main (string[] args)
        {
            //创建access数据库连接
            string strConnection="provider=microsoft.jet.oledb.4.0;data source=./Database.mdb";
            //创建sql语句
            string sql="select oldtext from md5";
            //new 一个数据库连接
            OleDbConnection objConnection=new OleDbConnection(strConnection);
            //得到command对象
            OleDbCommand accessComm = new OleDbCommand(sql,objConnection);
            //打开数据库连接
            objConnection.Open();
            //执行sql语句得到 Reader对象
            OleDbDataReader  _reader = accessComm.ExecuteReader();
            //从reader中拿出数据  并打印出来
            while(_reader.Read())
            {
                Console.WriteLine(_reader.GetString(0).ToString()); 
            }

            //关闭数据库连接
            objConnection.Close(); 

        }
    }
}