public class ServerManager
    {
       
        private Socket Server; // создаём сокет для сервера
        private IPHostEntry HostEntry; // информация о хосте
        private IPAddress Address; // предосталяет коллекцию ip-адресов сервера 
        private IPEndPoint EndPoint; // точка подключения

        public ServerManager()
        {
            CreateConnectPoint();
            CreateSocket();
        }
        /// <summary>
        /// Создание точки подключения
        /// </summary>
        public void CreateConnectPoint()
        {
            // получаем имя компьютера и выводим его
            string hostName = Dns.GetHostName();
            Console.WriteLine("Computer name: " + hostName);

            // узнаём имя хоста и выводим его
            HostEntry = Dns.GetHostEntry(hostName);
            Console.WriteLine("Host name: " + HostEntry.HostName);

            // выбираем ip-адрес для создания сервера
            int serverPort;
            if (HostEntry.AddressList.Length == 1)
            {
                Console.WriteLine("Creating server on: " + HostEntry.AddressList[0]);

                Address = HostEntry.AddressList[0];

                Console.Write("Enter the server port: ");
                serverPort = int.Parse(System.Console.ReadLine());
            }
            else
            {
                Console.WriteLine("---- ---- ---- ----");
                Console.WriteLine("IP address list: ");

                // выводим список всех ip-адресов
                int addressIndex = 0;
                foreach (IPAddress tmpAdress in HostEntry.AddressList)
                {
                    Console.WriteLine(addressIndex + ": " + tmpAdress);
                    addressIndex++;
                }

                // спрашиваем пользователя
                Console.WriteLine("---- ---- ---- ----");
                Console.Write("Enter index of adress for creating a server: ");
                addressIndex = int.Parse(System.Console.ReadLine());

                // говорим, где будем создавать сервер
                Console.WriteLine("Creating server on: " + HostEntry.AddressList[addressIndex]);

                // получаем адрес, необходимый пользователю
                Address = HostEntry.AddressList[addressIndex];

                Console.Write("Enter the server port: ");
                serverPort = int.Parse(System.Console.ReadLine());
            }

            // создаем конечную точку подключения 
            EndPoint = new IPEndPoint(Address, serverPort);
        }

        /// <summary>
        /// Создание Сокета Сервера
        /// </summary>
        public void CreateSocket()
        {
                try
                {

                    // создаем сокет сервера на текущей машине
                    Server = new Socket(AddressFamily.InterNetwork,
                            SocketType.Stream, ProtocolType.Tcp);
                    
                    

                    Console.WriteLine("Server socket created.");
                }
                catch (SocketException error)
                {
                    // 10061 - порт подключения занят/закрыт
                    if (error.ErrorCode == 10061)
                    {
                        Console.WriteLine("Connection port is closed or busy.");
                        Console.WriteLine("Press any key to exit...");
                        Console.ReadKey();
                    }
                }

                // прослушивание
                try
                {
                    // cвязываем удаленную точку с сокетом
                    Server.Bind(EndPoint);
                    // устанавливаем лимит подключений
                    Server.Listen(10);
                    

                    // ждем подключение клиента
                    while (true)
                    {
                        Console.WriteLine("Waiting connection...");
                        
                        Server = Server.Accept();                                              

                        if (Server.Connected)
                        {
                            Console.WriteLine("Connection established.");
                            Console.ReadKey();
                            break;                            
                        }
                        
                        
                    }

                   
                }
                catch
                {
                    throw new Exception("Connection problem.");
                }
                
                
            
            
        }

        

        // отправка сообщения клиенту
        public void SendMessage()
        {
            string Message;

            Console.WriteLine("Enter your message:");
            Message = Console.ReadLine();

            byte[] ByteMsg = Encoding.Unicode.GetBytes(Message);
            
              
            Server.Send(ByteMsg);

            Console.WriteLine("Message sended.");            

        }


    }