class Program
    {
        static byte[] ESC = { 0x1B  };
        static byte[] UP = System.Text.ASCIIEncoding.ASCII.GetBytes("[A");
        static byte[] DOWN = System.Text.ASCIIEncoding.ASCII.GetBytes("[B");

        static bool Runnig = true;
        static void Main(string[] args)
        {

            using (var client = new SshClient("hostname", "username", "password"))
            {
                client.Connect();
                var stream = client.CreateShellStream("vt220", 40, 20, 800, 600, 0);

                var readThread = new Thread(() =>
                {
                    while (Runnig)
                    {
                        Console.Write(stream.Read());
                    }

                } );
                readThread.Start();

                while (true)
                {
                    var key = Console.ReadKey(true);
                    switch(key.Key)
                    {
                        case ConsoleKey.A:
                            //Why a? why not, just testing
                            stream.Write("A");
                            break;
                        case ConsoleKey.Escape:
                            //Exit and forget about it
                            Runnig = false;
                            client.Disconnect();
                            return;
                        case ConsoleKey.UpArrow:
                            stream.Write(ESC, 0, ESC.Length);
                            stream.Write(UP, 0, UP.Length);
                            stream.Flush();
                            break;
                        case ConsoleKey.DownArrow:
                            stream.Write(ESC, 0, ESC.Length);
                            stream.Write(DOWN, 0, DOWN.Length);
                            stream.Flush();
                            break;
                    }
                }
            }

        }
    }