PS1 | Klient ECHO

using System;
using System.Text;
using System.Net.Sockets;
using System.Net;


namespace Klient_ECHO
{
    class Program
    {

        public static void closeConnection(Socket socket)
        {
            Console.WriteLine("Disconnected from server...");
            socket.Shutdown(SocketShutdown.Both);
            socket.Close();
        }

        public static void tryConnection(Socket socket)
        {

            bool tryAgain = true;
            while (tryAgain)
            {
                Console.Write("Which port you want to connect [7]? : ");
                string port = Console.ReadLine(); if (port == "") port = "7";

                try
                {
                    IPEndPoint ipep = new IPEndPoint(IPAddress.Parse("127.0.0.1"), int.Parse(port));

                    try
                    {
                        socket.Connect(ipep);
                        Console.WriteLine("Connected to " + ipep.ToString());
                        tryAgain = false;
                    }
                    catch (SocketException e)
                    {
                        Console.Write("Unable to connect to server, want to try with another port? [y/n]: ");
                        string ca = Console.ReadLine();
                        if (ca.ToLower() == "y" || ca.ToLower() == "yes") tryAgain = true;
                        else tryAgain = false;
                    }
                }
                catch (FormatException e)
                {
                    Console.WriteLine("This is not a number, try again.");
                }

            }
        }

        static void Main(string[] args)
        {
            byte[] data = new byte[1024];
            string input, stringData;

            Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

            tryConnection(socket);

            int recv = 0;
            stringData = Encoding.ASCII.GetString(data, 0, recv);
            Console.WriteLine(stringData);

            while (true)
            {
                input = Console.ReadLine();

                if (input == "close") break;
                else
                {
                    socket.Send(Encoding.ASCII.GetBytes(input));
                    data = new byte[1024];
                    recv = socket.Receive(data);
                    stringData = Encoding.ASCII.GetString(data, 0, recv);
                    Console.WriteLine("Reply from server: " + stringData);
                }
            }

            closeConnection(socket);
        }
    }
}