Three Layered Web Application

public static void ForceLogin()
{
    HttpCookie cookie = HttpContext.Current.Request.Cookies[cookieName];

    if (cookie != null)
    {
        if (Regex.IsMatch(cookie.Value, "^[0-9]+\.[a-f0-9]+$"))
        {
            using (EibxDataContext db = new EibxDataContext())
            {
                int count = db.Logins.Count(l => l.Password == cookie.Value);

                if (count == 1)
                {
                    return;
                }
            }
        }
    }

    HttpContext.Current.Response.Redirect("~/Login.aspx");
}