/// <summary>
/// Hàm tiến hành gọi mua một sản phẩm
/// </summary>
private void buyChoosedProduct()
{
int count = Convert.ToInt32(pageDetailsProducts.TabChooseToBuy.CountProduct);
if (billManager.existBill(sanPhamCurrent))
{
sanPhamCurrent.Count += count;
updateBill(true);
}
else if (count > 0)
{
sanPhamCurrent.Count = count;
billManager.addBill(sanPhamCurrent);
lbCountProduct.Text = billManager.countBill().ToString();
lbCountProduct.Visible = true;
createProductsPurchased();
}
}