问一会员登录验证cookie问题!

Question

public string Login()
        {            string CookieUserName = FormsAuthentication.FormsCookieName;
            HttpCookie authCookie = Context.Request.Cookies[CookieUserName];
            if (null == authCookie)
            {
                return null;
            }
            FormsAuthenticationTicket authTicket = null;
            try
           {
               authTicket = FormsAuthentication.Decrypt(authCookie.Value);
            }
            catch (Exception ex)
            {
                return null;
            }
            if (null == authTicket)
            {
                return null;
            }
            return authTicket.Name;
        } 根据以上代码怎么获取是否登录,用户会员名是什么?