private PictureManager GetPictureManager(Boolean refresh = false)
        {
            if (_pictureManager.IsNull() || refresh)
            {
                _pictureManager            = new PictureManagerSingleThreadCache();
                _pictureManager.DataSource = new PictureDataSource();
            }

            return(_pictureManager);
        }
 public PictureManagerSingleThreadCacheTest()
 {
     _pictureManager = null;
 }