private void deleteBookBtn_Click(object sender, EventArgs e)
{
if (lbBooks.SelectedItem == null)
{
MessageBox.Show("Please select a book you would like to delete.");
}
else if (bookService.BookHasBookCopies(lbBooks.SelectedItem as Book))
{
MessageBox.Show("You have to remove all the bookcopies related to the book before you can delete the book.");
}
else
{
bookService.Remove(lbBooks.SelectedItem as Book);
}
}
