protected void Page_Load(object sender, EventArgs e)
        {
            HttpCookie login = Request.Cookies["login"];
            HttpCookie sign  = Request.Cookies["sign"];

            if (login != null && sign != null)
            {
                if (sign.Value == SignGenerator.GetSign(login.Value + "bytepp"))
                {
                    return;
                }
            }
            Response.Redirect("Login.aspx");
        }