write a function to receive a whole number and return true if the digits are in ascending order from right to left

public static bool IsAscending(int number)
    {
        string str = number.ToString();
        int[] nums = str.Select(c => c - '0').ToArray();
        for (int i = 0; i < nums.Length-1; i++)
        {
            if (nums[i] > nums[i + 1])
                return false;
        }
        return true;
    }