public void OnSelectedBookChangeRemove(object source, EventArgs e, BookDTO book)
 {
     AvaibleBooks.Remove(book);
     PickedBooks.Add(book);
     foreach (var item in BorrowsList)
     {
         if (item.SelectedBook != book)
         {
             item.Books.Remove(book);
         }
     }
 }
        public void Remove(NewBook book)
        {
            if (book.SelectedBook != null)
            {
                foreach (var item in BorrowsList)
                {
                    item.Books.Add(book.SelectedBook);
                }
                AvaibleBooks.Add(book.SelectedBook);
            }
            BorrowsList.Remove(book);
            int number = 1;

            foreach (var item in BorrowsList)
            {
                item.BookNumber = "Book " + number.ToString();
            }
            number = 1;
            NotifyOfPropertyChange(() => CanAdd);
            NotifyOfPropertyChange(() => BorrowsList);
        }