How to: Scan directories without recursion
Still on the subject of scanning directories 
. On my post at code project, Oleg Shilo replied with the following code which shows how you can scan directores without using recursion. Pretty smart code, although this way you don't exactly walk the directory tree, but gradually work your way down one level at a time. Couldn't resist posting it here:
VS 2005 version:
private void WalkDirectories()
{ int index = 0;
List<string> dirList = new List<string>();
List<string> fileList = new List<string>();
dirList.Add(Environment.CurrentDirectory);
while (index < dirList.Count)
{ foreach (string dir in Directory.GetDirectories(dirList[index]))
dirList.Add(dir);
foreach (string file in Directory.GetFiles(dirList[index]))
fileList.Add(file);
index++;
}
}
VS 2003 version:
private void WalkDirectories()
{ int index = 0;
ArrayList dirList = new ArrayList();
ArrayList fileList = new ArrayList();
dirList.Add(@"C:\");
while (index < dirList.Count)
{ foreach (string dir in Directory.GetDirectories(dirList[index].ToString()))
dirList.Add(dir);
foreach (string file in Directory.GetFiles(dirList[index].ToString()))
fileList.Add(file);
index++;
}
}