while (true)

                {

                    try

                    {

                        DateTime now = DateTime.Now;

                        message = GetMessage();

                        message = String.Format("{0}",  message);                      

                        string[] names = message.Split(':',',');

                        string person = names[0].Trim(new char[] { '@' });

                        if (names.Length > 1)

                        {

                            var person_1 = server.clients.FirstOrDefault(p => p.userName == person);

                            if (person_1 != null)

                            {

                                message = String.Format("{0}: {1:t}  {2}", userName, now, message);

                                byte[] data = Encoding.Unicode.GetBytes(message);

                                person_1.Stream.Write(data, 0, data.Length);

                                Console.WriteLine(message);                               

                            }

                            else

                            {

                                string a = "Пользователя с таким именем не существует";

                                byte[] data = Encoding.Unicode.GetBytes(a);

                                Stream.Write(data, 0, data.Length);

                            }

                        }

                        else if (names.Length > 3)

                        {

                            for (int i = 0; i<names.Length; i++)

                            {

                                var selectedclients = server.clients.Where(t => t.userName.Contains(names[i]));

                                if (selectedclients != null)

                                {

                                    message = String.Format("{0}: {1:t}  {2}", userName, now, message);

                                    byte[] data = Encoding.Unicode.GetBytes(message);

                                    selectedclients.Stream.Write(data, 0, data.Length);

                                    Console.WriteLine(message);

                                }

                            }

                        }

                        else

                        {

                            message = String.Format("{0}: {1}",userName, message);

                            server.BroadcastMessage(message, this.Id);

                            Console.WriteLine(message);

                        }

                    }

                    catch

                    {

                        message = String.Format("{0}: покинул чат", userName);

                        Console.WriteLine(message);

                        server.BroadcastMessage(message, this.Id);

                        break;

                    }

                }

            }