CloverExamplePOS.StoreDiscount.DiscountNumber_ParentChanged C# (CSharp) Метод

        private void DiscountNumber_ParentChanged(object sender, EventArgs e)
        {
            if(Parent != null)
            {
                int index = Parent.Controls.IndexOf(this);
                DiscountNumber.Text = (index+1).ToString();
            }
        }