how to get all files in a folder(recursive)

// How much deep to scan. (of course you can also pass it to the method)
const int HowDeepToScan=4; 

public static void ProcessDir(string sourceDir, int recursionLvl) 
{
    if (recursionLvl<=HowDeepToScan)
    {
        // Process the list of files found in the directory. 
        string [] fileEntries = Directory.GetFiles(sourceDir);
        foreach(string fileName in fileEntries)
        {
            // do something with fileName
            Console.WriteLine(fileName);
        }


        // Recurse into subdirectories of this directory.
        string [] subdirEntries = Directory.GetDirectories(sourceDir);
        foreach(string subdir in subdirEntries)
            // Do not iterate through reparse points
            if ((File.GetAttributes(subdir) &
            FileAttributes.ReparsePoint) !=
            FileAttributes.ReparsePoint)
                ProcessDir(subdir,recursionLvl+1);
    }
}

Reference
http://weblogs.asp.net/israelio/archive/2004/06/23/162913.aspx