    using System;
    using System.Collections;
    using System.ComponentModel;
    using System.Data;
    using System.Drawing;
    using System.Web;
    using System.Web.SessionState;
    using System.Web.UI;
    using System.Web.UI.WebControls;
    using System.Web.UI.HtmlControls;

    namespace ASPNET.StarterKit.Commerce {

        public class AddToCart : System.Web.UI.Page {

            public AddToCart() {
                Page.Init += new System.EventHandler(Page_Init);
            }

            //*******************************************************
            //
            // The Page_Load event on this page is used to add the
            // identified product to the user's shopping cart, and then immediately
            // redirect to the shoppingcart page (this avoids problems were a user hits
            // "refresh" and accidentally adds another product to the cart)
            //
            // The product to add to the cart is specified using
            // a querystring argument to the page.
            //
            //*******************************************************

            private void Page_Load(object sender, System.EventArgs e) {

                if (Request.Params["ProductID"] != null) {

                    ASPNET.StarterKit.Commerce.ShoppingCartDB cart = new ASPNET.StarterKit.Commerce.ShoppingCartDB();

                    // Obtain current user's shopping cart ID
                    String cartId = cart.GetShoppingCartId();

                    // Add Product Item to Cart
                    cart.AddItem(cartId, Int32.Parse(Request.Params["ProductID"]), 1);
                }

                Response.Redirect("ShoppingCart.aspx");
            }

            private void Page_Init(object sender, EventArgs e) {
                //
                // CODEGEN: This call is required by the ASP.NET Web Form Designer.
                //
                InitializeComponent();
            }

            #region Web Form Designer generated code
            /// <summary>
            /// Required method for Designer support - do not modify
            /// the contents of this method with the code editor.
            /// </summary>
            private void InitializeComponent() {
                this.Load += new System.EventHandler(this.Page_Load);
            }
            #endregion
        }
    }