//数据绑定
public void bind()
{
int customerID = Convert.ToInt32(Session["userid"]);
cart = new cartBLL(customerID);
GridView1.DataSource = cart.showCartInfo();
GridView1.DataBind();
}
protected void Button1_Click(object sender, EventArgs e)
{
int ID = int.Parse(Request.QueryString["id"].ToString());
bookShop.DAL.Book b = new bookShop.DAL.Book();
b.bookID = ID;
b.bookAmount = int.Parse(amountLabel.Text);
cartBLL cb = new cartBLL();
cb.addBookToCart(b, Convert.ToInt32(Session["userid"]), 1);
}