HttpCookie cookie = new HttpCookie("shop");
//cookie.values集合能夠存儲多個鍵值對，其中add方法的第一個參數(shù)是商品編號，第二個參數(shù)是商品名稱和價格，中間用都好分隔。
cookie.Values.Add("1", "電腦,2000");
cookie.Values.Add("2", "電視,2200");
cookie.Values.Add("3", "冰箱,2300");
cookie.Expires = DateTime.Now.AddDays(1);
Response.Cookies.Add(cookie);

/// <summary>
/// 顯示購物車
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void Button2_Click(object sender, EventArgs e)
{
  LoadShop();
}
//顯示購物車
private void LoadShop()
{
  //首先判斷名稱為"shop"的cookie是否存在
  if (Request.Cookies["shop"] != null)
  {
    HttpCookie cookie = Request.Cookies["shop"];
    StringBuilder sb = new StringBuilder();
    sb.Append("<table>");
    //便利此cookie的values集合，取出每一個鍵值對
    for (int i = 0; i < cookie.Values.Count; i++)
    {
      sb.Append("<tr>");
      sb.Append("<td>");
      sb.Append("<a href=WebForm5.aspx?id=" + cookie.Values.AllKeys[i] + ">刪除<a/>");
      sb.Append("</td>");
      sb.Append("<td>");
      //獲取每個鍵值對中的值
      string[] shops = cookie.Values[i].Split(',');
      //獲取商品名稱
      sb.Append("<td>" + shops[0] + "</td>");
      //獲取商品價格
      sb.Append("<td>" + shops[1] + "</td>");
      sb.Append("</td>");
      sb.Append("</tr>");
    }
    sb.Append("</table>");
    mydiv.InnerHtml = sb.ToString();
  }
}

protected void Page_Load(object sender, EventArgs e)
{
  if (!IsPostBack)
  {
    if (!string.IsNullOrEmpty(Request.QueryString["id"]))
    {
      string id = Request.QueryString["id"];
      DeleteShop(id);
    }
  }
}
private void DeleteShop(string id)
{
  if (Request.Cookies["shop"] != null)
  {
    HttpCookie cookie = Request.Cookies["shop"];
    cookie.Values.Remove(id);
    if (cookie.Values.Count == 0)
    {
      cookie.Expires = DateTime.Now.AddDays(-1);
    }
    Response.Cookies.Add(cookie);
    LoadShop();
  }
}