private void lstAppliedDiscounts_SelectedIndexChanged(object sender, EventArgs e)
{
Discount discountSelected;
if (lstDiscounts.SelectedItems.Count == 1)
{
discountID = lstDiscounts.SelectedItems[0].Text;
discountSelected = discountsAvailable.GetDiscount(discountID);
//if the discount is unapplied
if (discountSelected != null)
{
//enable application
btnInsert.Enabled = true;
cboItemsToApplyTo.Enabled = true;
btnRemove.Enabled = false;
txtDiscountID.Text = discountSelected.DiscountID;
txtPercentage.Text = Convert.ToString(discountSelected.Percent);
txtDiscountDescription.Text = discountSelected.DiscountDescription;
//if discount is variable make percent editable
if (discountSelected.DiscountType == Discount_Type.Variable_Discount)
{
txtPercentage.ReadOnly = false;
}
else //if discount is fixed disable edit
{
txtPercentage.ReadOnly = true;
}
}
else
{
txtPercentage.ReadOnly = true;
btnRemove.Enabled = true;
//disable application
btnInsert.Enabled = false;
cboItemsToApplyTo.Enabled = false;
}
}
else
{
txtDiscountID.Clear();
txtDiscountDescription.Clear();
txtPercentage.Clear();
//disable apply/unapply
btnInsert.Enabled = false;
btnRemove.Enabled = false;
disableDiscountApplication();
}
}
private void btnRemove_Click(object sender, EventArgs e)
{
Discount discountSelected = discountsApplied.GetDiscount
(lstDiscounts.SelectedItems[0].Text);
//return discount to available discounts
discountsAvailable.Add
(discountSelected);
discountsApplied.Delete(discountSelected);
//unapply discount
discountsAvailable.GetDiscount
(discountSelected.DiscountID).ItemAppliedTo = "";
discountsAvailable.GetDiscount
(discountSelected.DiscountID).Amount = 0.00M;
//repopulate
populateDiscountsList();
populateTotalDiscount();
btnRemove.Enabled = false;
}