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public class StackBasedIteration
{
    static void Main(string[] args)
    {
        TraverseTree(args[0]);
 
        Console.WriteLine("Press key");
        Console.ReadKey();
    }
 
    public static void TraverseTree(string root)
    {
        Stack<string> dirs = new Stack<string>(20);
 
        if (!System.IO.Directory.Exists(root))
        {
            throw new ArgumentException();
        }
        dirs.Push(root);
 
        while (dirs.Count > 0)
        {
            string currentDir = dirs.Pop();
            string[] subDirs;
            try
            {
                subDirs = System.IO.Directory.GetDirectories(currentDir);
            }
            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;
            }
            foreach (string file in files)
            {
                try
                {
                    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)
                {
                    Console.WriteLine(e.Message);
                    continue;
                }
            }
            foreach (string str in subDirs)
                dirs.Push(str);
        }
    }
}

prog.cs(7,9): error CS0103: The name `Console' does not exist in the current context
prog.cs(8,9): error CS0103: The name `Console' does not exist in the current context
prog.cs(13,9): error CS0246: The type or namespace name `Stack' could not be found. Are you missing `System.Collections.Generic' using directive?
prog.cs(17,23): error CS0246: The type or namespace name `ArgumentException' could not be found. Are you missing `System' using directive?
prog.cs(19,9): error CS0841: A local variable `dirs' cannot be used before it is declared
prog.cs(21,16): error CS0841: A local variable `dirs' cannot be used before it is declared
prog.cs(23,33): error CS0841: A local variable `dirs' cannot be used before it is declared
prog.cs(29,20): error CS0246: The type or namespace name `UnauthorizedAccessException' could not be found. Are you missing `System' using directive?
prog.cs(36,17): error CS0103: The name `Console' does not exist in the current context
prog.cs(46,20): error CS0246: The type or namespace name `UnauthorizedAccessException' could not be found. Are you missing `System' using directive?
prog.cs(55,17): error CS0103: The name `Console' does not exist in the current context
prog.cs(63,21): error CS0103: The name `Console' does not exist in the current context
prog.cs(67,21): error CS0103: The name `Console' does not exist in the current context
prog.cs(72,17): error CS0841: A local variable `dirs' cannot be used before it is declared
Compilation failed: 14 error(s), 0 warnings

Standard output is empty