private void btnUpdateQuantity_Click(object sender, EventArgs e)
{
int selected = lstInventory.SelectedIndices[0];
Product selectedProd = products[selected];
Transaction updateQty = new Transaction(selectedProd.discountPrice, selectedProd);
updateQty.associatedProduct.productQuantity = 10;
updateQty.UpdateTransaction();
}
static void khalil()
{
TransactionHandler th = new TransactionHandler();
//th.AddTransaction(new Transaction(0.0M, Product.GetAllProducts()[0]));
//th.AddTransaction(new Transaction(0.0M, Product.GetAllProducts()[1]));
Transaction t = new Transaction(2.00M, Product.GetAllProducts()[0]);
Transaction r = TransactionHandler.GetReversedTransaction(t);
Console.WriteLine(t.calcCostWithExclusiveDisc());
t.purchasedQuantity = 5;
t.UpdateTransaction();
//th.ApplyGlobalDiscount(15);
Console.WriteLine(r.calcCostWithExclusiveDisc());
}