gistfile1.cs

 public static bool ishappy(int num)
        {

            List<int> seen = new List<int>();
            seen.Add(num);

            List<int> multiples = new List<int>();
            while (true)
            {
                int digits = numdigits(num);

                int moddder = 10;
                for (int i = 1; i <= digits; i++)
                {
                    int digit = getdigit(num,i);
                    multiples.Add(digit);
                }
                int total = 0;
                foreach (int m in multiples)
                {
                    total += (m * m);
                }
                
                if (seen.Contains(total))
                    return false;
                if (total == 1)
                    return true;
                seen.Add(total);
                num = total;
                multiples.Clear();
                Console.WriteLine("Just calculated " + total);
            }            
        }

        public static int getdigit(int num,int digit)
        {
            int val;
            int middle = num/(int)(Math.Pow(10,digit-1));
            val = middle % 10;
            return val;
        }
        public static int numdigits(int num)
        {
            int digits = 1;
            if (num < 10)
                return digits;          
            while (num >= 10)
            {
                digits++;
                num /= 10;
            }
            return digits;
        }

        static void Main(string[] args)
        {
            Console.WriteLine("+++++++++++++++++++++++++++++++++++++++");
            Console.WriteLine("+ Welcome to eBay SDK for .Net Sample +");
            Console.WriteLine("+ - ConsoleAddFixedPriceItem          +");
            Console.WriteLine("+++++++++++++++++++++++++++++++++++++++");

            //[Step 1] Initialize eBay ApiContext object
            ApiContext apiContext = GetApiContext();

            Console.WriteLine(ishappy(7));
            Console.WriteLine(ishappy(2));
        }