private void bnShowCart_Click(object sender, EventArgs e)
{
// XXX Show Cart Button event handler
while (true)
{
try
{
// to capture an exception from SelectedIndex/SelectedItem of carDisplay
cartDialog.ClearDisplayItems();
//cartDialog.AddDisplayItems(null); // null is a dummy argument
BookShopControl.showCartInformation(cartDialog);
switch (cartDialog.Display())
{
case DialogReturn.CheckOut: // check out
// XXX
BookShopControl.checkOutCustomer();
return;
case DialogReturn.ReturnBook: // remove a book
// XXX
BookShopControl.removeBookFromCustomerCart(BookShopControl.LoggedinCustomer.currentCart.itemsPurchased[cartDialog.SelectedIndex].purchaseBook.isbn);
continue;
case DialogReturn.Done: // cancel
return;
}
}
catch (BookShopException bsex)
{
MessageBox.Show(this, bsex.ErrorMessage);
continue;
}
catch (NullReferenceException nex)
{
MessageBox.Show(this, nex.Message);
return;
}
}
}