public class BookViewModel : ViewModelBase
    {
        private readonly Book _book;

        public BookViewModel(Book book)
        {
            this._book = book;
        }
        public string Title
        {
            get { return _book.Title; }
        }

        public string Author
        {
            get { return _book.Author; }
        }

        public int Count
        {
            get { return _book.Count;}
        }

        public double Price
        {
            get { return _book.Price; }
        }

        public string Publisher
        {
            get { return _book.Publisher; }
        }
    }