RankSystem.RankSystem.IsRank C# (CSharp) Method

        private static bool IsRank(string rank)
        {
            bool isrank = false;
            for (int i = 0; i < RankConfig.Ranks.Length; i++)
            {
                for (int j = 0; j < RankConfig.Ranks[i].Length; j++)
                    if (RankConfig.Ranks[i][j] == rank)
                        isrank = true;
            }
            return isrank;
        }