Iterate numbers with recursive

gistfile1.cs

        IEnumerable<int[]> IterateWithReverse(int lower = 0, int upper = 10, int depth = 10, int[] slots = null)
        {
            if (slots == null) slots = new int[depth];

            for (int i = lower; i < upper; i++)
            {
                slots[depth - 1] = i;
                if (depth > 1)
                    foreach (var x in IterateWithReverse(lower, upper, depth - 1, slots)) yield return x;
                else
                    yield return slots.Reverse().ToArray();
            }
        }