请帮我看看这个问题？

class program
{
        static void main（string[] args)
        {
            int testrecord1 = 500001;
            int tempvar;
            int newrecord;

            tempvar = getfirstnum（testrecord1);
            if （tempvar == 5)
            {
                newrecord = getlastnum（testrecord1);
                newrecord++;
                int pre = （int)math.pow（10, （getrecordlength（testrecord1) - 1));
                int result = pre * 5 + newrecord;

                console.writeline（result);
            }
            else if （tempvar == 9)
            {
                // like above
            }
        }

        private static int getfirstnum（int record)
        {
            return int32.parse（record.tostring（).substring（0, 1));
        }

        private static int getlastnum（int record)
        {
            string rcd = record.tostring（);
            string temp = rcd.substring（rcd.lastindexof（'0'), rcd.length - rcd.lastindexof（'0'));
            int result = 0;
            int32.tryparse（temp, out result);
            return result;
        }

        private static int getrecordlength（int record)
        {
            return record.tostring（).length;
        }
}