move_files.cs

    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Enter base directory:");
            var basePath = Console.ReadLine();
            Console.WriteLine("Enter destination directory (this will be created for you, make sure it doesn't exist):");
            var destination = Console.ReadLine();
            var directories = System.IO.Directory.EnumerateDirectories(basePath);

            foreach (var directory in directories)
            {
                System.IO.Directory.Move(directory, destination);
            }
            
            if (Console.ReadKey().Key == ConsoleKey.Spacebar)
            {
                System.Environment.Exit(0);
            }
        }
    }