static string FizzBuzz(int n) {
            if (n < 3)
                return "";
            if (n % 5 + n % 3 == 0)
                return "FizzBuzz," + FizzBuzz(n - 1);
            if (n % 3 == 0)
                return "Fizz," + FizzBuzz(n - 1);
            if (n % 5 == 0)
                return "Buzz," + FizzBuzz(n - 1);
            return n + "," + FizzBuzz(n - 1);
        }

foreach (var item in FizzBuzz(100).Split(',').Reverse())
            {
                Console.WriteLine(item);
            }