Convert from base-10 to base-N

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            var data = Console.ReadLine();
            List<ulong> nums = data.Split().Select(ulong.Parse).ToList();
            List<ulong> res = new List<ulong>();
            var baseNum = nums[0];
            var number = nums[1];
            while (number!=0)
            {
                var result = number % baseNum;
                res.Add(result);
                number = number / baseNum;
            }
            var revRes = string.Join("", res);
            revRes = new string(revRes.Reverse().ToArray());
            Console.WriteLine(revRes);
        }
    }
}