Directory Recursion (using memoization)

recurse.cs

void Main()
{
	Queue<string> directories = new Queue<string>(Directory.GetDirectories(@"C:\Windows\system32\"));
	do
	{
		string dir = directories.Dequeue();
		Console.WriteLine("Directory: " + dir);
		try
		{
			string[] subdirs = Directory.GetDirectories(dir);
			foreach(string subdir in subdirs)
			{
				directories.Enqueue(subdir);
			}
		}
		catch(UnauthorizedAccessException ex)
		{
			Console.WriteLine(ex.Message);
		}
	}
	while(directories.Count > 0);
}