Form4.cs

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.OleDb;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace DrawTables
{
    public partial class FrmRect : Form
    {
        public FrmRect()
        {
            InitializeComponent();
        }

        OleDbConnection dbConn = null;

        /// <summary>
        /// 当窗口载入的时候连接数据库
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void FrmRect_Load(object sender, EventArgs e)
        {
            if (dbConn == null)
            {
                dbConn = new OleDbConnection();
                //动态获取数据库物理路径, 不转义斜杠
                dbConn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0; Data Source=" +
                                          Application.StartupPath + @"\forDraw.mdb";
            }
            if (dbConn.State == ConnectionState.Closed)
            {
                try
                {
                    dbConn.Open();
                }
                catch (Exception ee)
                {
                    MessageBox.Show("连接数据库失败!");
                    this.Close();
                }
            }
        }

        private void FrmRect_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (dbConn.State == ConnectionState.Open)
            {
                dbConn.Close();
                dbConn = null;
            }
        }

        /// <summary>