DataSet导出Excel

public void GetExcel(DataSet ds, string typeid, string FileName)        {            HttpResponse resp;            resp = Page.Response;            resp.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");            resp.AppendHeader("Content-Disposition", "attachment;filename=" + FileName);            string colHeaders = "", ls_item = "";            int i = 0;

            //定义表对象与行对像，同时用DataSet对其值进行初始化             DataTable dt=ds.Tables[0];             DataRow[] myRow = dt.Select("");            // typeid=="1"时导出为EXCEL格式文件；typeid=="2"时导出为XML格式文件             if (typeid == "1")            {                //取得数据表各列标题，各标题之间以＼t分割，最后一个列标题后加回车符                 for (i = 0; i < dt.Columns.Count; i++)                {                    if (i == dt.Columns.Count-1)                        colHeaders += dt.Columns[i].Caption.ToString() + "/n";                    else                        colHeaders += dt.Columns[i].Caption.ToString() + "/t";                                    }                //向HTTP输出流中写入取得的数据信息                 resp.Write(colHeaders);                //逐行处理数据                 foreach (DataRow row in myRow)                {                    //在当前行中，逐列获得数据，数据之间以＼t分割，结束时加回车符＼n                     for (i = 0; i < dt.Columns.Count; i++)                    {                        if (i == dt.Columns.Count - 1)                            ls_item += row[i].ToString() + "/n";                        else                            ls_item += row[i].ToString() + "/t";                                                                                                    //当前行数据写入HTTP输出流，并且置空ls_item以便下行数据                     }                    resp.Write(ls_item);                    ls_item = "";                }            }            else            {                if (typeid == "2")                {                    //从DataSet中直接导出XML数据并且写到HTTP输出流中                     resp.Write(ds.GetXml());                 }            }            //写缓冲区中的数据到HTTP头文件中             resp.End();

        }