C# excel数据导入

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;

namespace 计算员工考勤信息
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
this.openFileDialog1.DefaultExt = "xls";
this.openFileDialog1.Filter = "Excel文件 (*.xls)|*.xls|(*.csv)|*.csv";
this.saveFileDialog1.DefaultExt = "xls";
this.saveFileDialog1.Filter = "Excel文件 (*.xls)|*.xls|(*.csv)|*.csv";
}
string url="";
string fileName="";//excel文件名
//选择excel表
private void btnBrowsing_Click(object sender, EventArgs e)
{
if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
this.txtUrl.Text = this.openFileDialog1.FileName;
url=txtUrl.Text;
fileName=url.Substring(url.LastIndexOf("//"));
}
}
//导入excel表
private void btnExport_Click(object sender, EventArgs e)
{
if (this.txtUrl.Text.Trim() == "")
{
MessageBox.Show("请选择excel表!");
}
else
{
//导入excel
this.panel1.Visible = true;
ExcelToDB(url);
}
}

/// <summary>
/// excel数据导入
/// </summary>
/// <param name="path">excel文件路径</param>
public void ExcelToDB(string path)
{
DataSet ds = new DataSet();
string connectionString = string.Format("Provider=Microsoft.Jet.OLEDB.4.0;Data Source={0};Extended Properties=/"Excel 8.0;HDR=Yes;IMEX=1/"", path);
OleDbConnection connection = new OleDbConnection(connectionString);
OleDbDataAdapter adapter = new OleDbDataAdapter("select * from [预定表$]", connection);
adapter.Fill(ds);
this.dataGridView1.DataSource = ds.Tables[0];
}

//导出excel表
private void btnDerived_Click(object sender, EventArgs e)
{

}
public void Bind(DataGridView dv,DataSet ds)
{
dv.DataSource = ds.Tables["ExcelInfo"];
}

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
DialogResult result = MessageBox.Show("确定要离开吗？", "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Information);
if (result == DialogResult.OK)
{
Application.Exit();
}
else
{
return;
}
}
}
}