Mario's solution will work fine. But it you would like to do Deep look up then consider following,
public class DirectoryLookup
{
public void DeepLookup(string dName)
{
DirectoryInfo directory = new DirectoryInfo(dName);
DirectoryInfo[] directories = directory.GetDirectories();
foreach (DirectoryInfo dir in directories)
{
DeepLookup(dir.FullName);
Console.WriteLine(dir.FullName);
}
}
}
Hope it helps. :)