CFServer.listener2.userlogin C# (CSharp) Method

        private void userlogin(packet data)
        {
            //string msg = string.Format("u+ {0},", cmd[1]);                //new comer's login msg

            string userpass = _client_password[data.Name] as string;
            if (_client_password.ContainsKey(data.Name) == false)
            {
                _client_password.Add(data.Name, data.Msg);
                using (StreamWriter sw = File.CreateText(path))
                {
                    foreach (DictionaryEntry de in _client_password)
                    {
                        string s = string.Format(de.Key + " " + de.Value);
                        sw.WriteLine(s);
                    }
                }

            }

            mutTable.WaitOne();
            Console.WriteLine("{0} 已登入，線上人數:{1}\n", data.Name, _client_table.Count);

            mutTable.ReleaseMutex();
        }