code snippet for "Encapsulating Collections" post

s1.cs

    public class Member
    {
        private readonly List<Member> _parents;
        private readonly List<Member> _children;
 
        public Member()
        {
            _parents = new List<Member>();
            _children = new List<Member>();
        }
 
        public IEnumerable<Member> Children
        {
            get { return _children; }
        }
 
        public IEnumerable<Member> Parents
        {
            get { return _parents; }
        }
 
        public void AddChild(Member child)
        {
            _children.Add(child);
        }
 
        public void RemoveChild(Member child)
        {
            _children.Remove(child);
        }
 
        public void AddParent(Member parent)
        {
            _parents.Add(parent);
        }
 
        public void RemoveParent(Member parent)
        {
            _parents.Remove(parent);
        }
    }