asp.net excel导出功能

protected void btn_Export_Click(object sender, EventArgs e)
    {
        string FileID = "";
        if (Request.QueryString["fujian"] != null && Request.QueryString["fujian"].ToString() != "")
        {
            FileID = Request.QueryString["fujian"].ToString();
        }
        string title = GetFileTile(FileID);//文件标题
        Workbook workbook = new Workbook(); //工作簿 
        Worksheet sheet = workbook.Worksheets[0]; //工作表
        Cells cells = sheet.Cells; //单元格         
        //列宽
        cells.SetColumnWidth(0, 20.00);
        cells.SetColumnWidth(1, 30.00);
        cells.SetColumnWidth(2, 30.00);
        cells.Merge(0, 0, 1, 3);//合并单元格

        cells[0, 0].PutValue(title + "/文件已学人员名单");
        cells[0, 1].PutValue("");
        cells[0, 2].PutValue("");
        cells[1, 0].PutValue("序号");
        cells[1, 1].PutValue("姓名");
        cells[1, 2].PutValue("时间");
        string sql = "order by StudyTime";
        ds = PublishBLL.GetCommentCount(FileID, sql);
        if (ds.Tables[0].Rows.Count > 0)
        {

            for (int i = 1; i < ds.Tables[0].Rows.Count + 1; i++)
            {
                //Aspose.Cells.Style styleTitle = workbook.Styles[workbook.Styles.Add()];//新增样式 
                //styleTitle.HorizontalAlignment = TextAlignmentType.Center;//文字居中 
                //styleTitle.Font.Name = "宋体";//文字字体 
                //styleTitle.Font.Size = 18;//文字大小 
                //styleTitle.Font.IsBold = true;//粗体 
                cells[i + 1, 0].PutValue("" + i.ToString().PadLeft(3, '0') + "");
                cells[i + 1, 1].PutValue("" + ds.Tables[0].Rows[i - 1]["StudyName"].ToString() + "");
                cells[i + 1, 2].PutValue("" + ds.Tables[0].Rows[i - 1]["StudyTime"].ToString() + "");
            }
        }
        string filename = "统计" + DateTime.Now.ToString("yyyyMMddHHmmss") + ".xls";
        string path = ConfigurationManager.AppSettings["StudyFile"] + @"\" + filename + "";
        workbook.Save(path);//保存到硬盘 

        #region 下载
        System.IO.MemoryStream ms1 = workbook.SaveToStream();//生成数据流 
        byte[] bt1 = ms1.ToArray();
        string fileName = "统计" + DateTime.Now.ToString("yyyyMMddHHmmss") + ".xls";//客户端保存的文件名 
        //以字符流的形式下载文件
        Response.ContentType = "application/vnd.ms-excel"; //通知浏览器下载文件而不是打开

        Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));
        Response.BinaryWrite(bt1);
        Response.Flush();
        Response.End();
        #endregion
    }