public static int DescendingOrder(int num)
    {
        int result = 0;

        var array = num.toIntArray();

        sortIntegersAscendingHelper comparer = new sortIntegersAscendingHelper();
        Array.Sort(array, comparer);

        result = int.Parse(String.Concat(array));

        return result;
    }
    public static int DescendingOrder(int num)
    {
        int result = 0;

        var array = num.toIntArray();

        sortIntegersAscendingHelper comparer = new sortIntegersAscendingHelper();

        Array.Sort(array, comparer);

        result = int.Parse(String.Concat(array));

        return(result);
    }