public static SingletonClass GetInstance(string keyPhrase)
        {
            lock (_locker)
            {
                if (_instance == null)
                {
                    _instance = new SingletonClass(keyPhrase);
                }
                return(_instance);
            }

            //if (_instance == null)
            //{
            //    _instance = new SingletonClass(keyPhrase);
            //}
            //return _instance;
        }