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

        internal bool IsMemberSinceAtLeastTwoYears()
        {
            return _joinDate.AddYears(2) <= DateTime.Today;
        }

 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));
 }