private void priceTab_Enter(object sender, EventArgs e)
{
promoComboBox.Items.Clear();
productComboBox.Items.Clear();
promoComboBox.Items.AddRange(PromoPresenter.GetPromotions().ToArray());
productComboBox.Items.AddRange(ProductPresenter.GetProducts().ToArray());
}
private void UpdatePromoDataGridView()
{
promoDataGridView.DataSource = PromoPresenter.GetPromotions();
}
