public void changeQuantityInCart(object sender, EventArgs e)
{
Button button = (Button)sender;
int id = Convert.ToInt32(button.Tag.ToString());
String operation = button.Text.ToString();
int i = 0;
Boolean found = false;
while (!found)
{
SaleItem item = cart[i];
if (item.getId() == id)
{
if (operation == "+")
{
item.incrementQuantity();
}
else
{
item.decrementQuantity();
}
found = true;
}
i++;
}
generateCart();
}