fCraft.RankManager.LowerRank C# (CSharp) Method

        public static bool LowerRank( Rank rank ) {
            if( rank == null ) throw new ArgumentNullException( "rank" );
            if( rank == Ranks.Last() ) {
                return false;
            }
            Rank nextRankDown = Ranks[rank.Index + 1];
            Ranks[rank.Index + 1] = rank;
            Ranks[rank.Index] = nextRankDown;
            RebuildIndex();
            return true;
        }