//double click on product row and open product detail window
private void productClick(object sender, EventArgs e)
{
int productId = int.Parse(productListView.SelectedItems[0].SubItems[0].Text);
Product.Product product = productManager.getProductById(productId, loggedUser.email, loggedUser.password);
productDetail detail = new productDetail(product, loggedUser, this);
detail.Show();
}