我的静态页面

 protected override void Render(HtmlTextWriter writer)
    {
        try
        {
            DateTime dt = System.IO.File.GetLastWriteTime("index.html");
            TimeSpan ts = dt - DateTime.Now;
            if (ts.TotalHours > 1)
            {
                System.IO.StringWriter html = new System.IO.StringWriter();
                System.Web.UI.HtmlTextWriter tw = new HtmlTextWriter(html);
                base.Render(tw);
                System.IO.StreamWriter sw = new System.IO.StreamWriter(Server.MapPath("index.html"), false, System.Text.Encoding.UTF8);
                sw.Write(html.ToString());
                sw.Close();
                tw.Close();
                Response.Redirect("Index.html");
            }
            else
            {
                Response.Redirect("Index.html");
            }
        }
        catch
        {
            System.IO.StringWriter html = new System.IO.StringWriter();
            System.Web.UI.HtmlTextWriter tw = new HtmlTextWriter(html);
            base.Render(tw);
            System.IO.StreamWriter sw = new System.IO.StreamWriter(Server.MapPath("index.html"), false, System.Text.Encoding.UTF8);
            sw.Write(html.ToString());
            sw.Close();
            tw.Close();
            Response.Redirect("Index.html");
        }
       
    }