public void CreateExcel1(DataSet ds, string typeid, string FileName)
    {
        HttpResponse resp = System.Web.HttpContext.Current.Response;
        
        resp.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
        resp.AppendHeader("Content-Disposition", "attachment;filename=" + FileName);
        resp.Charset = "UTF-8";
        //HttpContext.Current.Response.ContentEncoding =System.Text.Encoding.Default;
        resp.ContentType = "application/ms-excel";//image/JPEG;text/HTML;image/GIF;vnd.ms-excel
        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
            colHeaders += "<table cellspacing=\"0\" cellpadding=\"5\" rules=\"all\" border=\"1\"> <tr style=\"font-weight: bold; white-space: nowrap;\">";
            for (i = 0; i < dt.Columns.Count - 1; i++)
                //colHeaders+=dt.Columns[i].Caption.ToString()+"\t";
                colHeaders += "<td>" + dt.Columns[i].Caption.ToString() + "</td>";
            //colHeaders +=dt.Columns[i].Caption.ToString() +"\n"; 
            colHeaders += "<td>" + dt.Columns[i].Caption.ToString() + "</td></tr>";
            //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)
            {
                ls_item += "<tr>";
                //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 - 1; i++)
                    //ls_item +=row[i].ToString().Replace("\t","") + "\t"; 
                    ls_item += "<td style=\"vnd.ms-excel.numberformat:@\">" + row[i].ToString().Replace("\t", "") + "</td>";
                ls_item += "<td>" + row[i].ToString().Replace("\t", "") + "</td></tr>";
                //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();
    }
//csharp/7262