System.Security.Util.TokenBasedSet.MoveNext C# (CSharp) Method

        internal bool MoveNext(ref TokenBasedSetEnumerator e)
        {
            switch (m_cElt)
            {
            case 0:
                return false;

            case 1:
                if (e.Index == -1)
                {
                    e.Index = m_maxIndex;
                    e.Current = m_Obj;
                    return true;
                }
                else
                {
                    e.Index = (short)(m_maxIndex+1);
                    e.Current = null;
                    return false;
                }

            default:
                while (++e.Index <= m_maxIndex)
                {
                    e.Current = m_Set[e.Index];
                    
                    if (e.Current != null)
                        return true;
                }

                e.Current = null;
                return false;
            }
        }

 public bool MoveNext()
 {
     return(_tb != null?_tb.MoveNext(ref this) : false);
 }