Jag ska skriva ett program som ska kunna kontrollera ett person nummer och behöver hjälp. C#

        static void Main(string[] args)
        {
            //Jag vill göra detta:
            int a = 990220133;
            //Till detta:
            int[] persNr = { 9, 9, 0, 2, 2, 0, 1, 3, 3, 0};
            //För att kunna utföra detta:
            int[] result = new int[10];
            int oneOrTwo = 0;


            for(int i = 0; i < persNr.Length; i++)
            {
                oneOrTwo = EvenOrNot(oneOrTwo); //Bestämmer om nästa ska gångras med 1 eller 2.
                int addTo = persNr[i] * oneOrTwo;
                Console.WriteLine(addTo + " = " + persNr[i] + " * " + oneOrTwo);
                result[i] = addTo;
                oneOrTwo++;
            }
            result = Check(result);
            TotalPersNumber(persNr, result);

        }

        public static int EvenOrNot(int oneOrTwo)
        {
            int one = 1, two = 2;
            if (oneOrTwo % 2 == 0)
            {
                return two;
            }
            else return one;
        }

        public static int[] Check(int[] persNr)
        {
            Boolean next = true;
            int total = persNr[0], nrOf = 0;
            while (next)
            {
                if (total > 10)
                {
                    total = total - 10;
                    nrOf++;
                }
                else if(total < 10)
                {
                    persNr[0] = nrOf;
                    persNr[9] = total;
                    
                    next = false;
                }
            }

            
            return persNr;
        }

        public static void TotalPersNumber(int[] original, int[] result) 
        {
            Boolean next = true;
            int addUp = 0, leftOver;
            for (int i = 0; i < result.Length; i++)
            {
                addUp = addUp + result[i];

            }
            leftOver = addUp;
            while (next)
            {
                if (leftOver > 10)
                {
                    leftOver = leftOver - 10;
                }
                else if (leftOver < 10)
                {
                    next = false;
                }
            }
            original[9] = leftOver;
            Print(original);
        }

        public static void Print(int[] toPrint)
        {
            for(int i = 0; i < toPrint.Length; i++)
            {
                Console.Write(toPrint[i]);
                if(i == 5)
                {
                    Console.Write("-");
                }

            }
        }