datagrid gridview 倒出数据为 excel 时,编号问题

        把gridview  中的数据倒出 为 excel时 (编号长时在 excel 中会变成科学计数)

//倒出按钮  

 protected void Btn_ExportClick(object sender, EventArgs e)
    {
        string style = @"<style> .text { mso-number-format:\@; } </script> "; 
          //主要是这
        Response.ClearContent();
        Response.AddHeader("content-disposition", "attachment; filename=MyExcelFile.xls");
        Response.ContentType = "application/excel";

        StringWriter sw = new StringWriter();
        HtmlTextWriter htw = new HtmlTextWriter(sw);

        gvUsers.RenderControl(htw);
        // Style is added dynamically
        Response.Write(style); 
        Response.Write(sw.ToString());
        Response.End();
    }

 //行绑定事件
 protected void gvUsers_RowDataBound(object sender, GridViewRowEventArgs e)
    {      

        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            e.Row.Cells[4].Attributes.Add("class", "text");  //主要是这
        }
    }

具体可以看这
http://gridviewguy.com/ArticleDetails.aspx?articleID=197