private void PopulateBookList()
{
List <Book> books = BookDb.GetAllBooks();
BooksComboBox.DataSource = books;
BooksComboBox.DisplayMember = nameof(Book.Title);
}
private void button1_Click(object sender, EventArgs e)
{
Book b = new Book();
b.ISBN = "79123";
b.Title = "Joe's Text Book";
b.Price = 10;
BookDb.AddBook(b);
MessageBox.Show("Book added!");
}