读取EXCEL的数据到datagridview

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

namespace WindowsApplication1
{
public partial class Form2 : Form
{
public Form2()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
this.openFileDialog1.ShowDialog();
this.textBox1.Text = this.openFileDialog1.FileName;
}

private void button2_Click(object sender, EventArgs e)
{
string fileName = "";
fileName = this.textBox1.Text;
if (this.textBox1.Text != "")
{
try
{
string strCon = " Provider = Microsoft.Jet.OLEDB.4.0 ; Data Source = " + fileName + " ;Extended Properties=Excel 8.0";
System.Data.OleDb.OleDbConnection myConn = new System.Data.OleDb.OleDbConnection(strCon);
string strCom = " SELECT * FROM [punishCase$] ";
System.Data.OleDb.OleDbDataAdapter myCommand = new System.Data.OleDb.OleDbDataAdapter(strCom, myConn);
System.Data.DataTable dt = new System.Data.DataTable();
myCommand.Fill(dt);
this.dataGridView1.DataSource = dt;
this.label1.Text = myConn.State.ToString();
}
catch
{
MessageBox.Show("请选择案件导入的EXCEL");

}



}
else
{
MessageBox.Show("请选择Excel文件");
}



}
}
}