formview中编辑回发的问题,很奇怪!!!

protected void Page_Load(object sender, EventArgs e)
    {
        if (PreviousPage != null && PreviousPage.IsCrossPagePostBack)
        {
            string mode = Request.QueryString["mode"];
            string kind = Request.QueryString["kind"];
            string pageIndex = Request.QueryString["pageIndex"];
            hidfldPageIndex.Value = pageIndex;
            hidfldKind.Value = kind;
            switch (mode)
            {
                case "ReadOnly":
                    frmviewNews.DefaultMode = FormViewMode.ReadOnly;
                    break;
                case "Edit":
                    frmviewNews.DefaultMode = FormViewMode.Edit;
                    string id = Request.QueryString["id"];
                    break;
                case "Insert":
                    frmviewNews.DefaultMode = FormViewMode.Insert;
                    break;
            }
        }
        Button btnBack = (Button)frmviewNews.FindControl("btnBack");
        btnBack.PostBackUrl = "~/Admin_Folder/News_Manage.aspx?pageindex=" + hidfldPageIndex.Value + "&kind=" + hidfldKind.Value;
        Label1.Text = btnBack.PostBackUrl;
    }
当我对点击formview的edittemplate里的commandname为update的button以后回发,当按btnBack返回时,不会回到news_manage.aspx,但label1里可以看到地址是正确的,有高手指教吗? --------------------编程问答-------------------- 绕弯了吧？
直接点：

Response.Redirect("~/Admin_Folder/News_Manage.aspx?pageindex= "   +   hidfldPageIndex.Value   +   "&kind= "   +   hidfldKind.Value);

--------------------编程问答-------------------- 帮你顶一下 --------------------编程问答-------------------- btnBack.PostBackUrl   =   "~/Admin_Folder/News_Manage.aspx?pageindex= "   +   hidfldPageIndex.Value   +   "&kind= "   +   hidfldKind.Value; 

如果只是为了取hidfldPageIndex.Value和hidfldKind.Value,为什么一定要用postbackurl的方式呢.

补充：.NET技术 ,  ASP.NET