Anagrams.Bag.Bag C# (CSharp) Method

        public Bag(string s)
        {
            Char[] chars = s.ToLower().ToCharArray();
            Array.Sort(chars);
            Char[] letters = Array.FindAll<char>(chars, Char.IsLetter);
            System.Text.StringBuilder sb = new System.Text.StringBuilder();
            sb.Insert(0, letters);
            guts = sb.ToString();
        }