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using System;
using System.IO;
using System.Collections.Generic;
 
namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            //StreamWriter w = new StreamWriter("list.txt", false);
            //Console.SetOut(w);
 
            string path = @"C:\";
 
            Stack<DirectoryInfo> stack = new Stack<DirectoryInfo>();
            Console.WriteLine(path);
 
            var di = new DirectoryInfo(path);
            foreach (var d in di.EnumerateDirectories("*", SearchOption.TopDirectoryOnly))
            {
                stack.Push(d);
            }
            foreach (var f in di.EnumerateFiles("*", SearchOption.TopDirectoryOnly))
            {
                Console.WriteLine(f.FullName);
            }
 
            while (stack.Count > 0)
            {
                di = stack.Pop();
                Console.WriteLine(di.FullName);
 
                foreach (var d in di.EnumerateDirectories("*", SearchOption.TopDirectoryOnly))
                {
                    stack.Push(d);
                }
                foreach (var f in di.EnumerateFiles("*", SearchOption.TopDirectoryOnly))
                {
                    Console.WriteLine(f.FullName);
                }
            }
 
            //w.Flush();
            //w.Close();
            //w.Dispose();
 
            Console.ReadLine();
        }
    }
}
 

prog.cs(20,34): error CS1061: Type `System.IO.DirectoryInfo' does not contain a definition for `EnumerateDirectories' and no extension method `EnumerateDirectories' of type `System.IO.DirectoryInfo' could be found (are you missing a using directive or an assembly reference?)
/usr/lib/mono/2.0/mscorlib.dll (Location of the symbol related to previous error)
prog.cs(24,34): error CS1061: Type `System.IO.DirectoryInfo' does not contain a definition for `EnumerateFiles' and no extension method `EnumerateFiles' of type `System.IO.DirectoryInfo' could be found (are you missing a using directive or an assembly reference?)
/usr/lib/mono/2.0/mscorlib.dll (Location of the symbol related to previous error)
prog.cs(34,38): error CS1061: Type `System.IO.DirectoryInfo' does not contain a definition for `EnumerateDirectories' and no extension method `EnumerateDirectories' of type `System.IO.DirectoryInfo' could be found (are you missing a using directive or an assembly reference?)
/usr/lib/mono/2.0/mscorlib.dll (Location of the symbol related to previous error)
prog.cs(38,38): error CS1061: Type `System.IO.DirectoryInfo' does not contain a definition for `EnumerateFiles' and no extension method `EnumerateFiles' of type `System.IO.DirectoryInfo' could be found (are you missing a using directive or an assembly reference?)
/usr/lib/mono/2.0/mscorlib.dll (Location of the symbol related to previous error)
Compilation failed: 4 error(s), 0 warnings

Standard output is empty