public class StackBasedIteration

{

    static void Main(string[] args)

    {

        // Specify the starting folder on the command line, or in

        // Visual Studio in the Project > Properties > Debug pane.

        TraverseTree(args[]);

        Console.WriteLine("Press any key");

        Console.ReadKey();

    }

    public static void TraverseTree(string root)

    {

        // Data structure to hold names of subfolders to be

        // examined for files.

        Stack<string> dirs = new Stack<string>();

        if (!System.IO.Directory.Exists(root))

        {

            throw new ArgumentException();

        }

        dirs.Push(root);

        while (dirs.Count > )

        {

            string currentDir = dirs.Pop();

            string[] subDirs;

            try

            {

                subDirs = System.IO.Directory.GetDirectories(currentDir);

            }

            // An UnauthorizedAccessException exception will be thrown if we do not have

            // discovery permission on a folder or file. It may or may not be acceptable

            // to ignore the exception and continue enumerating the remaining files and

            // folders. It is also possible (but unlikely) that a DirectoryNotFound exception

            // will be raised. This will happen if currentDir has been deleted by

            // another application or thread after our call to Directory.Exists. The

            // choice of which exceptions to catch depends entirely on the specific task

            // you are intending to perform and also on how much you know with certainty

            // about the systems on which this code will run.

            catch (UnauthorizedAccessException e)

            {

                Console.WriteLine(e.Message);

                continue;

            }

            catch (System.IO.DirectoryNotFoundException e)

            {

                Console.WriteLine(e.Message);

                continue;

            }

            string[] files = null;

            try

            {

                files = System.IO.Directory.GetFiles(currentDir);

            }

            catch (UnauthorizedAccessException e)

            {

                Console.WriteLine(e.Message);

                continue;

            }

            catch (System.IO.DirectoryNotFoundException e)

            {

                Console.WriteLine(e.Message);

                continue;

            }

            // Perform the required action on each file here.

            // Modify this block to perform your required task.

            foreach (string file in files)

            {

                try

                {

                    // Perform whatever action is required in your scenario.

                    System.IO.FileInfo fi = new System.IO.FileInfo(file);

                    Console.WriteLine("{0}: {1}, {2}", fi.Name, fi.Length, fi.CreationTime);

                }

                catch (System.IO.FileNotFoundException e)

                {

                    // If file was deleted by a separate application

                    //  or thread since the call to TraverseTree()

                    // then just continue.

                    Console.WriteLine(e.Message);

                    continue;

                }

            }

            // Push the subdirectories onto the stack for traversal.

            // This could also be done before handing the files.

            foreach (string str in subDirs)

                dirs.Push(str);

        }

    }

}