求解：导出Excel文件，数字字符串被强制转换成科学技术法啦！！！

通过asp.net怎么操作excel文件，我想把我生成的excel文件的某些列变成不是科学技术法的格式，例如
201307051624263000而不是2.01307E+17


public static void Export(DataSet ds, Page ps, string title)
    {
        if (ds != null && ds.Tables.Count > 0 && ds.Tables[0].Rows.Count > 0)
        {
            DateTime now = DateTime.Now;
            string tmpSortDate = now.ToShortDateString();
            Random Rnd = new Random(Environment.TickCount);
            //string newname = title;
            string newname = now.ToString("yyyyMMddHHmmss") + Rnd.Next(10000000, 99999999).ToString();
            string m = HttpUtility.UrlEncode(newname, System.Text.Encoding.UTF8) + ".xls";

            
            HttpResponse resp = ps.Response;
            resp.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
            resp.ContentType = "application/ms-excel";
            resp.AppendHeader("Content-Disposition", "attachment;filename=" + m); 
            string colHeaders = "", ls_item = "";
            DataTable dt = ds.Tables[0];
            DataRow[] myRow = dt.Select();
            int i = 0;
            int cl = dt.Columns.Count;
            int cols = cl - 1;//总列数，最后一列‘序号’不显示
            for (i = 0; i < cols; i++)
            {
                if (i == (cols - 1))
                {
                    colHeaders += dt.Columns[i].Caption.ToString() + "\n";
                }
                else
                {
                    colHeaders += dt.Columns[i].Caption.ToString() + "\t";
                }
            }
            resp.Write(colHeaders);

            foreach (DataRow row in myRow)
            {
                for (i = 0; i < cols; i++)
                {
                    string temp = row[i].ToString();
                    if (i == (cols - 1))
                    {

                        ls_item += " " + temp + "\n";
                    }
                    else
                    {
                        ls_item += " " + temp + "\t";
                    }
                }
                resp.Write(ls_item);
                ls_item = "";
            }
            resp.End();
        }
    } Excel ASP.NET 技术 --------------------编程问答-------------------- 指定单元格为文字列  --------------------编程问答--------------------

dg.Cells[5].Attributes.Add("style", "vnd.ms-excel.numberformat: @;");

--------------------编程问答-------------------- 这边有你想要的答案。 --------------------编程问答-------------------- 可以在导出的数字字符前面加个单引号,使导出的内容变为文本格式 --------------------编程问答--------------------  foreach (DataRow row in myRow)
            {
                for (i = 0; i < cols; i++)
                {
                    string temp = row[i].ToString() + " ";
                    if (i == (cols - 1))
                    {

                        ls_item += " " + temp + "\n";
                    }
                    else
                    {
                        ls_item += " " + temp + "\t";
                    }
                }
                resp.Write(ls_item);
                ls_item = "";
            }

补充：.NET技术 ,  ASP.NET