Winform中Excel导入Sqlserver中报“外部表不是预期的格式。”咋回事？

Winform中Excel导入Sqlserver中报“外部表不是预期的格式。”怎么回事？急
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 BookMangersSYS
{
  public partial class ExcelToServer : Form
  {
  public ExcelToServer()
  {
  InitializeComponent();
  }

  private void btnExcel_Click(object sender, EventArgs e)
  {
  OpenFileDialog openFile = new OpenFileDialog();//打开文件对话框。 
  openFile.Filter = ("*.xls|*.xlsx");//后缀名。 
  openFile.ShowDialog();
  XlsToDataTable(openFile.FileName);
  }

  //获取连接
  private DataSet XlsToDataTable(String strpath)
  {  
  string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + strpath + ";" 
  + "Extended Properties=Excel 8.0;";
  OleDbConnection conn = new OleDbConnection(strConn);
  conn.Open();//????????????这里报错。
  string strExcel = "";
  OleDbDataAdapter myCommand = null;
  DataSet ds = null;
  strExcel = "select * from [sheet1$]";
  myCommand = new OleDbDataAdapter(strExcel, strConn);
  ds = new DataSet();
  myCommand.Fill(ds, "table1");
  return ds;

  }

------解决方案--------------------
我想你用的应该是office2007吧，你只要将那个xlsx文件另存为标准格式XLS文件再读取就行了