NoBodyToBuild.SampleD.TeamMember.IsPartOf C# (CSharp) Method

        internal bool IsPartOf(TeamId teamId)
        {
            return _teamId.Equals(teamId);
        }

 public TeamChairmanship AppointChairman(TeamMember member)
 {
     Enforce.That(member.IsPartOf(_id), Sorry.NotPartOfTheTeam);
     Enforce.That(member.IsMemberSinceAtLeastTwoYears(), Sorry.NotMemberSinceAtLeastTwoYears);
     return(new TeamChairmanship(_id, member.Id, DateTime.Today));
 }