public bool ContainsKey(EngineConfigurationName key)
 {
     lock (configuration)
     {
         return configuration.ContainsKey(key);
     }
 }
        public string this[EngineConfigurationName key]
        {
            get
            {
                lock (configuration)
                {
                    return configuration[key];
                }
            }

            set
            {
                lock (configuration)
                {
                    configuration[key] = value;
                }
            }
        }