Membership.GetUser(); is null after create

hi,
how come
Membership.GetUser(); is null after this code:


   Membership.CreateUser(model.UserName, model.Password, model.Email, null, null, true, null,
                                      out createStatus);

                if (createStatus == MembershipCreateStatus.Success)
                {

                    //todo finish verification else wherei in this class before continu

           ...