protected void addtoCart_Click(object sender, EventArgs e)
{
//add certain number of selected product to cart
List <Product> p = (List <Product>)Session["Products"];
Customer aCustomer = (Customer)Session["Customer"];
int qty = Convert.ToInt16(txtQuantity.Text);
int prodId = Convert.ToInt16(Request.QueryString["id"]);
aCustomer = CartFunctions.addItemtoCart(p, aCustomer, prodId, qty);
lblQty.Text = txtQuantity.Text + " ";
lblProduct.Text = "x " + lblProdTitle.Text + " added to your cart";
Session["Customer"] = aCustomer;
//displays products bought with
ClientScript.RegisterStartupScript(GetType(), "hwa", "confirmOrder();", true);
Label lblCost = (Label)this.Master.FindControl("lblCost");
lblCost.Text = CartFunctions.getSubTotal(aCustomer).ToString("C");
Label lblItem = (Label)this.Master.FindControl("lblItems");
lblItem.Text = CartFunctions.getNumItem(aCustomer).ToString() + " items";
}