购物车（Session）

WendwCart.cs
using System;
using System.Data;
using System.Web.Configuration;
using System.Web.UI;
using System.Collections;

namespace WendwCart 
{
    [Serializable]
    public class Stat_Class
    {
        private string Tenpo_ID = WebConfigurationManager.AppSettings["tenpoid"].Trim();
        string ShangPinID; 
        string Sp_Name;
        double Sp_Price; 
        int Sp_Quan; 
        public string ItemID
        {
            get { return ShangPinID; }
            set { ShangPinID = value; }
        }

        public string ShangpinName
        {
            get { return Sp_Name; }
        }

        public double Price
        {
            get { return Sp_Price; }
        }

        public int Quantity
        {
            get { return Sp_Quan; }
            set { Sp_Quan = value; }
        }

        public Stat_Class(string ItemID,int Quantity)
        {
            ShangPinID = ItemID;
            string sqlSelect = "select * from syouhin where tenpo_id=" + Tenpo_ID + " and syouhin_id=" + ItemID;
            DataSet ds = Help.Select(sqlSelect);
            
            Sp_Name = ds.Tables[0].Rows[0]["syouhin_name"].ToString();
            Sp_Price = Convert.ToDouble(ds.Tables[0].Rows[0]["SYOUHIN_SALE_PRICE"].ToString());
            Sp_Quan = Quantity;
        }
    }

    [Serializable]
    public class ShoppingCart
    {
        Hashtable Cart_Orders = new Hashtable();
        public ICollection Orders
        {
            get { return Cart_Orders.Values; }
        }

        public Hashtable Orders_Hash
        {
            get { return Cart_Orders; }
        }

        public double TotalCost
        { 
            get
            {
                double total = 0;
                foreach (DictionaryEntry entry in Cart_Orders)
                {
                    Stat_Class order = (Stat_Class)entry.Value;
                    total += (order.Price * order.Quantity);
                }
                return total;
            }
        }

        public double TotalCount
        {
            get
            {
                double count = 0;
                foreach (DictionaryEntry entry in Cart_Orders)
                {
                    Stat_Class order = (Stat_Class)entry.Value;
                    count += order.Quantity;
                }
                return count;
            }
        }

        public void AddItem(Stat_Class Order)
        { 
            Stat_Class order = (Stat_Class)Cart_Orders[Order.ItemID];
            if (order != null)
            {
                order.Quantity += Order.Quantity;
            }    
            else
            {
                 Cart_Orders.Add(Order.ItemID, Order);
            }
        }

        public void DeleteItem(String ItemID)
        { 
            if (Cart_Orders[ItemID] != null)
            {
                Cart_Orders.Remove(ItemID); 
            }     
        }
    }
}