All_Folders

            List<string> dirs = new List<string>(Directory.GetDirectories("C:\\"));
            string[] t;

            for(int i = 0; i < dirs.Count; i++)
            {
                try
                {
                    t = Directory.GetDirectories(dirs[i]);
                    foreach(string q in t)
                    {
                        dirs.Add(q);
                    }
                }
                catch
                {
                    continue;
                }
            }

            dirs.Sort();

            for(int i = 0; i < dirs.Count; i++)
            {
                Console.WriteLine(dirs[i]);
            }