asp.net解决数据转换为DBNULL的问题

if (string.IsNullOrEmpty(CookieHelper.GetCookie("DEPID", "theway").ToString()) == false || CookieHelper.GetCookie("DEPID", "theway").ToString() != "")
            {
                UserDataBind(int.Parse(CookieHelper.GetCookie("PEOID", "theway").ToString()), int.Parse(CookieHelper.GetCookie("DEPID", "theway").ToString()));//绑定人员列表
            }