// Below this method is used when user clicks add button creating an instance of the sale.
// The if loop checks to see if the method is null and if not null the method adds the sale to the sale listbox.
private void btnAdd_Click(object sender, System.EventArgs e)
{
frmNewSale newSaleForm = new frmNewSale();
Sale sale = newSaleForm.GetNewSale();
if (sale != null)
{
sales.Add(sale);
SaleDB.SaveSales(sales);
FillSaleListBox();
}
}
//Below this method is used when user clicks delete button, a confirmation dialog is displayed.
// If user confirms the sale is removed from the sale list. 2 if loops are used.
private void btnDelete_Click(object sender, System.EventArgs e)
{
int i = lstSales.SelectedIndex;
if (i != -1)
{
Sale sale = (Sale)sales[i];
string message = "Are you sure you want to delete "
+ sale.Description + "?";
DialogResult button =
MessageBox.Show(message, "Confirm Delete",
MessageBoxButtons.YesNo);
if (button == DialogResult.Yes)
{
sales.Remove(sale);
SaleDB.SaveSales(sales);
FillSaleListBox();
}
}
}