ASP.NET导出EXECL字符串01被自动转成1怎么解决

    private void ExportExcel(System.Data.DataTable dt)    {        System.Web.HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");        System.Web.HttpContext.Current.Response.Buffer = false;        System.Web.HttpContext.Current.Response.Clear();        System.Web.HttpContext.Current.Response.Cache.SetCacheability(HttpCacheability.NoCache);        System.Web.HttpContext.Current.Response.ClearHeaders();        System.Web.HttpContext.Current.Response.ContentType = "application/vnd.ms-excel";        System.Web.HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + DateTime.Now.ToString("yyyyMMddHHmmss") + ".xls");        string sep = "";        foreach (DataColumn dc in dt.Columns)        {            System.Web.HttpContext.Current.Response.Write(sep + dc.ColumnName);            sep = "\t";        }        System.Web.HttpContext.Current.Response.Write("\n");        int i;        foreach (DataRow dr in dt.Rows)        {            sep = "";            for (i = 0; i < dt.Columns.Count; i++)            {                string mes = dr[i].ToString();                if (i == 8)                {                    mes = " " + dr[i].ToString();                }                System.Web.HttpContext.Current.Response.Write(sep + mes);                sep = "\t";            }            System.Web.HttpContext.Current.Response.Write("\n");        }        System.Web.HttpContext.Current.Response.End();    }