Anagrams.Form1.acceptable C# (CSharp) Method

        private bool acceptable(string s)
        {
            if (s.Length < 2)
            {
                if (s == "i" || s == "a")
                    return true;
                return false;
            }
            char[] vowels = { 'a', 'e', 'i', 'o', 'u', 'y' };
            if (s.IndexOfAny(vowels, 0) > -1)
                return true;
            return false;
        }