Solution Review: Generate Binary Numbers From 1 to N Using Queue

using System;
using System.Collections;
namespace chapter_4
{
    class Challenge_1
    {
        //Start with Enqueuing 1.
        //Dequeue a number from queue and append 0 to it and enqueue it back to queue.
        //Perform step 2 but with appending 1 to the original number and enqueue back to queue.
        //Queue takes integer values so before enqueueing it make sure to convert string to integer.
        //Size of Queue should be 1 more than number because for a single number we're enqueuing two
        //variations of it , one with appended 0 while other with 1 being appended.
        static string [] findBin(int n)
        {
            string [] result = new string[n];
            Queue queue = new Queue();
            queue.Enqueue(1);
            string s1, s2;
            for (int i = 0; i < n; i++)
            {
                result[i] = queue.Dequeue().ToString();
                s1 = result[i] + "0";
                s2 = result[i] + "1";
                queue.Enqueue(Convert.ToInt32(s1));
                queue.Enqueue(Convert.ToInt32(s2));
            }
            return result;
        }
        static void Main(string[] args)
        {
            var output = findBin(4);
            for (int i = 0; i < 4; i++)
                Console.Write(output[i] + " ");
           
            return;
        }
    }
}