C#如何打开DBF数据库文件

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

namespace WindowsApplication4
{
    public partial class Form1 : Form
    {

        public Form1()
        {
            InitializeComponent();
        }       

        private void BindData(string table)
        {
            try
            {
                string str = table.Substring(, table.LastIndexOf('\\'));
                using (System.Data.OleDb.OleDbConnection conn = new System.Data.OleDb.OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + str
                                                                + ";Extended Properties=dBASE IV;User ID=Admin;Password="))
                {
                    conn.Open();
                    string sql = @"select * from " + table.Substring(table.LastIndexOf("\\"));
                    System.Data.OleDb.OleDbDataAdapter da = new System.Data.OleDb.OleDbDataAdapter(sql, conn);
                    DataTable dt = new DataTable();
                    da.Fill(dt);
                    this.dataGridView1.DataSource = dt.DefaultView;
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }

        }

        private void button1_Click(object sender, EventArgs e)
        {
            this.openFileDialog1.FileName = "*.DBF";
            if (openFileDialog1.ShowDialog()== DialogResult.OK)
            {
                this.BindData(this.openFileDialog1.FileName);
            }
        }
    }
}