public Book(int _id)
{
BookId = _id;
Title = BookCRUD.getTitle(_id);
Author = BookCRUD.getAuthor(_id);
Type = BookCRUD.getType(_id);
PenaltyCost = BookCRUD.getPenaltyCost(_id);
ReturnDate = BookCRUD.getReturnDate(_id);
State = BookCRUD.getState(_id);
}