页面重定向到一个有文件下载功能的页面时，跳转不了

悬赏园豆：5 [待解决问题]

现在有test1.aspx和test2.aspx两个页面，我要点击test1.aspx的按钮跳转到test2.aspx页面即Response.Redirect("test2.aspx")，而在test2.aspx中的Page_Load事件中则有
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class test2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            string path = HttpContext.Current.Server.MapPath("~/js/DD_belatedPNG_0.0.8a-min.js");//路径
            if (File.Exists(path))  //如果文件存在
            {
                FileInfo fileInfo = new FileInfo(path);
                HttpContext.Current.Response.Clear();
                HttpContext.Current.Response.ClearContent();
                HttpContext.Current.Response.ClearHeaders();
                HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode("下载名称.js"));//HttpUtility.UrlEncode防止文件下载时"文件名"出现中文乱码
                HttpContext.Current.Response.AddHeader("Content-Length", fileInfo.Length.ToString());
                HttpContext.Current.Response.AddHeader("Content-Transfer-Encoding", "binary");
                HttpContext.Current.Response.ContentType = "application/octet-stream";
                HttpContext.Current.Response.ContentEncoding = Encoding.GetEncoding("gb2312");
                HttpContext.Current.Response.WriteFile(fileInfo.FullName);
                HttpContext.Current.Response.Flush();
                HttpContext.Current.Response.End();
            }
        }
    }
}
当点击test1.aspx的按钮想要跳转到test2.aspx页面时，就出现了下载对话框，而且下载完后都没有跳转到test2.aspx页面，还是停留在test1.aspx页面
我想要实现的效果是先跳到test2.aspx页面后才开始下载文件！
先谢谢各位了！