c#读取access数据库

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Data.OleDb;

namespace test_db
{
    public partial class Form1 : Form
    {
        string dbfile = "ccd.mdb";
        string connstr = "Provider=Microsoft.Jet.OleDb.4.0;Data Source=";
        string userpwd = ";Jet OLEDB:Database Password=123456;Persist Security Info=False;";

        public Form1()
        {
            InitializeComponent();
            connstr = connstr + Application.StartupPath +"\\" +dbfile;
            connstr = connstr + userpwd;
        }

        private void buttonX1_Click(object sender, EventArgs e)
        {
            //MessageBox.Show(connstr);
            //OleDbConnection conn = new OleDbConnection(connstr);
            //string strSQL = "insert into quickstart (qsort) values('应用程序')";
            //SqlExecute(strSQL);
            string strSQL = "select * from quickstart";
            OleDbDataReader odr = SqlGetReader(strSQL);
            if (odr.Read())
            {
                MessageBox.Show(odr["qsort"].ToString());
            }
            odr.Close();
            odr.Dispose();
        }

        //执行sql语句
        private void SqlExecute(string strSQL)
        {
            using (OleDbConnection conn = new OleDbConnection(connstr))
            {
                OleDbCommand command = new OleDbCommand(strSQL, conn);
                conn.Open();
                command.ExecuteNonQuery();
                conn.Close();
            }
        }

        //取得记录集
        private OleDbDataReader SqlGetReader(string strSQL)
        {
            OleDbConnection conn = new OleDbConnection(connstr);
            
                conn.Open();
                OleDbCommand command = conn.CreateCommand();
                command.CommandText = strSQL;
                OleDbDataReader odr = command.ExecuteReader();
                return odr;
            
        }
    }
}