private void buttonSweet_Click(object sender, EventArgs e)
{
FormSweet formSweet = new FormSweet();
formSweet.Owner = this;
formSweet.Show();
}
private void buttonAdd_Click(object sender, EventArgs e)
{
FormSweet formSweet = this.Owner as FormSweet;
FormOrder main = formSweet.Owner as FormOrder;
candy.Name = listCandy.Text;
candy.Weight = (double)weight.Value;
main.order.ListGoods.Add(candy);
main.labelOrder.Text = main.order.ToString();
main.labelTotalPrice.Text = Convert.ToString(main.order.TotalPrice);
this.Close();
formSweet.Close();
}