private void btnDelete_Click(object sender, EventArgs e)
{
var book = new Book
{
Id = int.Parse(lblId.Text),
Title = txtTitle.Text,
Author = txtAuthor.Text,
Price = decimal.Parse(txtPrice.Text),
Description = txtDescription.Text,
CountryId = (int)cmbCountry.SelectedValue
};
BookRepo repo = new BookRepo();
repo.DeleteBookId(book.Id);
LoadBooks();
}