private  void button1_click(object sendeer,EventArgs e)
{
 OpenFileDialog  openFiledialog1=new OpenFileDialog();
 openFileDialg1.filter="Excel文件|*.xls";
 openFileDialg1.ShowDialog();
 textBox1.Text=openFileDialog1.FileName;
}

private void button2_click(object sender, EventArg e)
{
 DataSet dt=ReadExcel(textBox1.Text);
 //然后進行您需要的數據處理
}