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using System.Data.OleDb;
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    private void Button_Click(object sender, System.EventArgs e)
    {
        string thefullname = this.uploadFile.PostedFile.FileName;//»ñÈ¡ÍêÕû·¾¶
        ClientScriptManager csm = Page.ClientScript;
        if (thefullname == "")
        {
            csm.RegisterStartupScript(GetType, "Error", "alert('ÇëÑ¡ÔñÒªÉÏ´«µÃExcelÎļþ');", true);
            return;
        }
        int fileLength = this.uploadFile.PostedFile.ContentLength;
        if (fileLength > 512000)
        {
            csm.RegisterStartupScript(GetType, "Error", "alert('ÎļþÒѳ¬¹ý500K£¬ÎÞ·¨ÉÏ´«£¡');", true);
            return;
        }
        FileInfo info = new FileInfo(thefullname);
        string fileExt = info.Extension;
        if (fileExt.ToLower() != ".xls")
        {
            csm.RegisterStartupScript(GetType, "Error", "alert('²»ÊÇExcelÎļþ£¬ÇëʹÓÃÕýÈ·µÄÎļþ¸ñʽ£¡');", true);
            return;
        }
        string uploadPath = Page.MapPath(@"uploadfile\report.xls");