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[TestClass]
    public class Problem8
    {

        [TestMethod]
        public void Answer()
        {
            var Consecutive5s =
                from a in 0.To(999 - 5)
                select new
                {
                    sum = ConsecutiveFive(a)
                        .Select(x => Convert.ToInt32(x))
                        .Product(),
                    numbers = ConsecutiveFive(a)
                };

            var max = Consecutive5s.First(x => x.sum == Consecutive5s.Max(y => y.sum));
            Console.WriteLine(max.sum);
        }

        static IEnumerable<Char> ConsecutiveFive(int start)
        {
            return numbers
                        .AsEnumerable()
                        .Skip(start)
                        .Take(5);

        }


        static string numbers = "7316717653133062491922511967442657474235534919493496983520312774506326239578318016984801869478851843858615607891129494954595017379583319528532088055111254069874715852386305071569329096329522744304355766896648950445244523161731856403098711121722383113622298934233803081353362766142828064444866452387493035890729629049156044077239071381051585930796086670172427121883998797908792274921901699720888093776657273330010533678812202354218097512545405947522435258490771167055601360483958644670632441572215539753697817977846174064955149290862569321978468622482839722413756570560574902614079729686524145351004748216637048440319989000889524345065854122758866688116427171479924442928230863465674813919123162824586178664583591245665294765456828489128831426076900422421902267105562632111110937054421750694165896040807198403850962455444362981230987879927244284909188845801561660979191338754992005240636899125607176060588611646710940507754100225698315520005593572972571636269561882670428252483600823257530420752963450";
    }

 public static int Product(this IEnumerable<int> source)
 {
            return source.Aggregate<int>((x, y) => x * y);
 }