private static IdList <TEntity> Load()
            {
                UserIdListData listData = PersistentDataUtil.Load <UserIdListData>(UserIdListUtil.DirectoryPath(), UserIdListUtil.Filename(), UserIdListUtil.CreateDefaultInstance);

                IdList <TEntity> userInstance = (IdList <TEntity>)ScriptableObject.CreateInstance(IdList <TEntity> .ListName());

                userInstance.InitializeWithUserIdListData(listData);

                return(userInstance);
            }
            private static void Save()
            {
                UserIdListData listData = new UserIdListData(UserIdListUtil._userInstance);

                PersistentDataUtil.Save(UserIdListUtil.DirectoryPath(), UserIdListUtil.Filename(), listData);
            }