asp.net web导出Excel 下载问题

    public void OutExcel(System.Data.DataTable dt)
    {
        StringWriter sw = new StringWriter();
        sw.WriteLine("姓名\t手机号码\t性别\tQQ\t生日\t工作单位\t备注");
        foreach (DataRow dr in dt.Rows)
        {
            sw.WriteLine(dr["姓名"] + "\t" + dr["手机号码"] + "\t" + dr["性别"] + "\t" + dr["QQ号"] + "\t" + dr["生日"] + "\t" + dr["工作单位"] + "\t" + dr["备注"]);
        }
        sw.Close();
        string filename = DateTime.Now.ToString("yyyyMMddhhMMss");
        Response.AddHeader("Content-Disposition", "attachment; filename=" + filename + ".xls");
        Response.ContentType = "application/ms-excel";
        Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
        Response.Write(sw);
        Response.End();
    }

上面是我导出Excel 的代码，客户端导出的时候出现下载的页面，下载却是整个页面。请高赐教怎么解决下载就是我需要的内容不是整个网页 --------------------编程问答-------------------- 我导出word,也是用的二进制流方法,跟你类似.
但是没出现过导出页面问题.
代码发给你看下.
Response.AppendHeader("Content-Disposition", "attachment;filename=result.doc");

            Response.ContentType = "application/ms-word";

            Response.Charset = "gb2312";

            Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");

            DataList1.Page.EnableViewState = false;

            System.IO.StringWriter writer = new System.IO.StringWriter();

            System.Web.UI.HtmlTextWriter htmlWriter = new System.Web.UI.HtmlTextWriter(writer);

           // htmlWriter.Write(aa);

            DataList1.RenderControl(htmlWriter);

            Response.Write(writer.ToString());

            Response.End();

补充：.NET技术 ,  其他语言