public void RemoveFromBookList(Book book)
 {
     // TODO: change book
     if (BookListID.Contains(book.Name))
     {
         BookListID.Remove(book.Name);
         Database.EditUser();
         book.AddToList--;
         Database.Edit(book);
     }
 }
 public void AddToBookList(Book book)
 {
     // TODO: change book
     if (!BookListID.Contains(book.Name))
     {
         BookListID.Add(book.Name);
         Database.EditUser();
         book.AddToList++;
         Database.Edit(book);
     }
 }