protected void btnAddToCart_Click(object sender, EventArgs e)
{
Validate();
if (Page.IsValid)
{
Book book = BookCatalogDataAccess.GetABookById(BookList.SelectedValue);
int quantity = Int16.Parse(txtQauntity.Text);
BookOrder order = new BookOrder(book, quantity);
cart.AddBookOrder(order);
BookList.Items.RemoveAt(BookList.SelectedIndex);
string amount = quantity > 1 ? "copies" : "copy";
lblDescription.Text = quantity + " " + amount + " of " + book.Title + " have been added to your cart";
btnViewCart.Text = "View Cart (" + cart.NumOfItems + " items)";
BookList.ClearSelection();
txtQauntity.Text = "";
}
}