using System;

​

public class Program

{

    public static void Main()

    {

        string filename = "C:\\Temp\\myfiledir\\testsubdir\\myfile.txt";

        int position = 0;

        int accumulatedPosition = 0;

        while (filename.Contains("\\"))

        {

            position = filename.IndexOf("\\") + 1;

            accumulatedPosition = accumulatedPosition + position;

            filename = filename.Substring(filename.Length - (filename.Length - position));

            System.Console.WriteLine(filename);

        }

    }

}