taskkill /F /IM notepad.exe

          UdpClient udpServer = new UdpClient(11000);
            while (true)
            {
                var remoteEndPoint = new IPEndPoint(IPAddress.Any, 11000);
                var data = udpServer.Receive(ref remoteEndPoint); // listen on port 11000

                string byteData = System.Text.Encoding.UTF8.GetString(data);

                Console.WriteLine("Got [" + byteData + "] from " + remoteEndPoint.ToString());

                // reply back ( status )
                Process[] processesToQuit = Process.GetProcessesByName("notepad");
                if (processesToQuit.Length >= 1)
                {
                    // if notepad is running
                    foreach (Process process in processesToQuit)
                    {
                        try
                        {
                            process.Kill();
                            Console.WriteLine("Success! Server Killed notepad.");
                            const string stringToSend = "Success! Server Killed notepad.";
                            byte[] bytearray = Encoding.ASCII.GetBytes(stringToSend);
                            udpServer.Send(bytearray, bytearray.Length, remoteEndPoint);
                        }
                        catch (Exception)
                        {
                            // if exception on killing notepad
                            Console.WriteLine("Killing notepad failed.");
                            const string stringToSend = "Killing notepad failed.";
                            byte[] bytearray = Encoding.ASCII.GetBytes(stringToSend);
                            udpServer.Send(bytearray, bytearray.Length, remoteEndPoint);
                        }
                    }
                }
                else
                {
                    // if notepad is not running
                    Console.WriteLine("Error: Process is not running. ( gives client that info ) .");
                    const string stringToSend = "notepad is not running.";
                    byte[] bytearray = Encoding.ASCII.GetBytes(stringToSend);
                    udpServer.Send(bytearray, bytearray.Length, remoteEndPoint);
                }
            }

            // creates Client
            var client = new UdpClient();

            // SERVER IP ( 127.0.0.1 ?)
            IPEndPoint ep = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 11000); // endpoint where server is listening
            client.Connect(ep);

            // what to send ( string )
            const string stringToSend = "kill notepad";

            // create byteArray of string "stringToSend"
            byte[] bytearray = Encoding.ASCII.GetBytes(stringToSend);

            // send byteArray
            client.Send(bytearray, bytearray.Length);

            // then receive data ( status )
            var receivedData = client.Receive(ref ep);

            string byteData = System.Text.Encoding.UTF8.GetString(receivedData);

            Console.WriteLine("Got [" + byteData + "] back from server: " + ep.ToString());

            Console.ReadKey();