public ContentVersionStorage(IFileStorage istorage = null)
        {
            if (istorage == null)
            {
                istorage = new ZipStorage("fv.zip");
            }
            this.storage = istorage;

            PopulateContents();
        }
        public ContentVersionStorage(IFileStorage istorage = null)
        {
            if (istorage == null)
            {
                istorage = new ZipStorage("fv.zip");
            }
            this.storage = istorage;

            PopulateContents();
        }