For loop between two numbers where direction is unknown, C#

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            int a = 2, b = 9;
            
            Console.WriteLine("From small to big");
            ForLoopUnknownDirection(a, b, i => Console.WriteLine(i));
            Console.WriteLine("From big to small");
            ForLoopUnknownDirection(b, a, i => Console.WriteLine(i));
           
            
        }
        
        static void ForLoopUnknownDirection(int start, int stop, Action<int> action)
        {
            int length = Math.Abs(start-stop);
            for(int i=0; i <= length; i++)
            {
                int step = (start < stop) ? start + i : stop + (length-i);
                action(step);
            }
        }
    }

}

Show compiler warnings [ + ] Show input
Compilation time: 0,14 sec, absolute running time: 0,09 sec, cpu time: 0,09 sec, average memory usage: 12 Mb, average nr of threads: 3