gridview导出excel重复列

Question

       在代码中我动态绑定列：
         BoundField cksl_Fild = new BoundField();
        cksl_Fild.DataField = ds.Tables[0].Columns["cksl"].ToString();
        cksl_Fild.HeaderText = "数量";
        cksl_Fild.ItemStyle.HorizontalAlign = HorizontalAlign.Right;
        cksl_Fild.FooterStyle.HorizontalAlign = HorizontalAlign.Right;
        cksl_Fild.DataFormatString = "{0:N}";
        cksl_Fild.HtmlEncode = false;
        GridView1.Columns.Add(cksl_Fild);        BoundField ckje_Fild = new BoundField();
        ckje_Fild.DataField = ds.Tables[0].Columns["ckje"].ToString();
        ckje_Fild.HeaderText = "出库金额";
        ckje_Fild.ItemStyle.HorizontalAlign = HorizontalAlign.Right;
        ckje_Fild.FooterStyle.HorizontalAlign = HorizontalAlign.Right;
        ckje_Fild.DataFormatString = "{0:N}";
        ckje_Fild.HtmlEncode = false;
        GridView1.Columns.Add(ckje_Fild);
导出代码：
    public static void ToExcel(System.Web.UI.Control ctl, string FileName)
    {
        HttpContext.Current.Response.Charset = "UTF-8";
        HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.UTF7;
        HttpContext.Current.Response.ContentType = "application/ms-excel";
        HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + "" + FileName + ".xls");
        ctl.Page.EnableViewState = false;
        System.IO.StringWriter tw = new System.IO.StringWriter();
        HtmlTextWriter hw = new HtmlTextWriter(tw);
        ctl.RenderControl(hw);
        HttpContext.Current.Response.Write(tw.ToString());
        HttpContext.Current.Response.End();
    }结果出现重复列了，导出数据是以前的两倍，怎么解决啊？？？？

Answer 1

GridView在动态添加时,应加多一个属性: GridView1.AutoGenerateColumns = false;

Answer 2

不行啊，我程序设置了GridView.AutoGenerateColumns = false,可导出数据时还时双倍的记录。郁闷，怎么回事。要是在属性中设置绑定列的话导出就没问题，可现在是程序中设置。怎么解决呢？？？