File Stream C#

using System;
using System.IO;
class Test 
{
    public static void Main() 
    {
            string path = @"c:\MyDir";
            if (!Directory.Exists(path)) 
            {
                Directory.CreateDirectory(path);
            } 
            else 
            {
                // Take an action which will affect the write time.
                Directory.SetLastWriteTime(path, new DateTime(1985,4,3));
            }
            // Get the creation time of a well-known directory.
            DateTime dt = Directory.GetLastWriteTime(path);
            Console.WriteLine("The last write time for this directory was {0}", dt);
      
            // Update the last write time.
            Directory.SetLastWriteTime(path, DateTime.Now);
            dt = Directory.GetLastWriteTime(path);
            Console.WriteLine("The last write time for this directory was {0}", dt);
    }
}