动态在页面上添加<form>的问题

  protected void Page_Load(object sender, EventArgs e)
    {

        HtmlForm fc =(HtmlForm)Page.Form.FindControl("form1");
        HtmlButton hb = new HtmlButton();
        hb.Attributes.Add("text","hu");
        fc.Controls.Add(hb);
        Page.Controls.Add(fc);
    }