C#.NET 数据库连接(Access)

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

using System.Data.OleDb; //添加引用。

namespace lianjie
{
    public partial class Form1 : Form
    {
      
         OleDbConnection strCon = new OleDbConnection();
         OleDbDataAdapter strDA;
         OleDbCommandBuilder strCB;
         DataTable strDT = new DataTable();
         int m_row = 0;
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            strCon.ConnectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source= E:\Database1.mdb ";
                strCon.Open();
                strDA = new OleDbDataAdapter("Select * from LIANXI", strCon);
                strCB = new OleDbCommandBuilder(strDA);
                strDA.Fill(strDT);

                this.showCurrentRecord();
        }

        private void showCurrentRecord()//显示纪录
        {
            if (strDT.Rows.Count == 0)
            {
                textBox1.Text = "000";
                textBox2.Text="NO";
                return;

            }
            textBox1.Text = strDT.Rows[m_row]["ID"].ToString();
            textBox2.Text=strDT.Rows[m_row]["name"].ToString();
        }

        private void button1_Click(object sender, EventArgs e)//第一条记录
        {
            m_row = 0;
            this.showCurrentRecord();
        }

        private void button2_Click(object sender, EventArgs e)//下一条
        {
            if (m_row<strDT.Rows.Count-1)
            {
                m_row++;
                this.showCurrentRecord();
            }
        }

        private void button3_Click(object sender, EventArgs e)//上一条
        {
            if (m_row != 0)
            {
                m_row--;
                this.showCurrentRecord();
            }
        }

        private void button4_Click(object sender, EventArgs e)//最后一条
        {
            if (strDT.Rows.Count != 0)
            {
                m_row = strDT.Rows.Count - 1;
                this.showCurrentRecord();
            }
        }

        private void button5_Click(object sender, EventArgs e)//ADD
        {
            DataRow strRow = strDT.NewRow();
            strRow["ID"] = textBox4.Text;
            strRow["name"] = textBox3.Text;
            strDT.Rows.Add(strRow);
            strDA.Update(strDT);
            m_row = strDT.Rows.Count - 1;
            this.showCurrentRecord();
        }

        private void button6_Click(object sender, EventArgs e)//Delete
        {
            if (strDT.Rows.Count != 0)
            {
                strDT.Rows[m_row].Delete();
                strDA.Update(strDT);
                m_row = 0;
                this.showCurrentRecord();
            }
        }
    }
}