first, i'm sorry i'm newbie here and newbie in aspnet. i learn some code from ebook but it's not working. and i'm really sorry too because my english is bad. when i debug my project its working fine, and i try to add item to my shopping cart its not show any error but the button do not work, its ike the product page only reload. i hope i can find the answer here. thanks for help. here the code CartAccess.cs

using System;
using System.Web;
using System.Data;
using System.Data.Common;

/// <summary>
/// Supports Shopping Cart functionality
/// </summary>
public class CartAccess
{
public CartAccess()
{
//
// TODO: Add constructor logic here
//
}

// returns the shopping cart ID for the current user
private static string shoppingCartId
{
    get
    {
        HttpContext context = HttpContext.Current;
        string cartId;
        {
            // check if the cart ID exists as a cookie
            if (context.Request.Cookies\["Delta\_CartID"\] != null)
            {
                // return the id
                //return context.Request.Cookies\["Delta\_CartID"\].Value;
                cartId = context.Request.Cookies\["Delta\_CartID"\].Value;
                return cartId;


            }
            else
            // if the cart ID doesn't exist in the cookie as well, generate a new ID
            {
                // generate a new GUID
                //Guid tempGuid = Guid.NewGuid();
                //context.Response.Cookies\["Delta\_CartID"\].Value = tempGuid.ToString();
                cartId = Guid.NewGuid().ToString();
                // create the cookie object and set its value
                HttpCookie cookie = new HttpCookie("Delta\_CartID", cartId);
                // set the cookie's expiration
                int howManyDays = deltaconfig.CartExpireDays;
                DateTime currentDate = DateTime.Now;
                TimeSpan timeSpan = new TimeSpan(howManyDays, 0, 0, 0);
                DateTime expirationDate = currentDate.Add(timeSpan);
                cookie.Expires = expirationDate;
                // set the cookie on the client's browser
                context.Response.Cookies.Add(cookie);
                // return the CartID
                return cartId.ToString();
            }
        }
    }
}

// Add a new s