asp.net Cookie操作

protected void Button2_Click(object sender, EventArgs e)
  {
  HttpCookie cookie=new HttpCookie("MyCook");//初使化并设置Cookie的名称
  DateTime dt=DateTime.Now;
  TimeSpan ts = new TimeSpan(0, 0, 1,0,0);//过期时间为1分钟
  cookie.Expires = dt.Add(ts);//设置过期时间
  cookie.Values.Add("userid", "userid_value");
  cookie.Values.Add("userid2","userid2_value2");
  Response.AppendCookie(cookie);
  //输出该Cookie的所有内容
  //Response.Write(cookie.Value); //输出为：userid=userid_value&userid2=userid2_value2 
  }

  //读取
  protected void Button1_Click(object sender, EventArgs e)
  {

  // HttpCookie cokie = new HttpCookie("MyCook");//初使化   不同页面要初始化cookie
  if (Request.Cookies["MyCook"]!=null)
  {
  //Response.Write("Cookie中键值为userid的值:" + Request.Cookies["MyCook"]["userid"]);//整行
  //Response.Write("Cookie中键值为userid2的值" + Request.Cookies["MyCook"]["userid2"]);
  Response.Write(Request.Cookies["MyCook"].Value);//输出全部的值
  }
  }

  //修改Cookie
  protected void Button3_Click(object sender, EventArgs e)
  {
  //获取客户端的Cookie对象
  HttpCookie cok = Request.Cookies["MyCook"];
   
  if (cok != null)
  {
  //修改Cookie的两种方法
  cok.Values["userid"] = "alter-value";
  cok.Values.Set("userid", "alter-value");

  //往Cookie里加入新的内容
  cok.Values.Set("newid", "newValue");
  Response.AppendCookie(cok);
  }

   
  }
  //删除Cookie
  protected void Button4_Click(object sender, EventArgs e)
  {

  HttpCookie cok = Request.Cookies["MyCook"];
  if (cok != null)
  {
  if (!CheckBox1.Checked)
  {
  cok.Values.Remove("userid");//移除键值为userid的值
  }
  else
  {
  TimeSpan ts = new TimeSpan(-1, 0, 0, 0);
  cok.Expires = DateTime.Now.Add(ts);//删除整个Cookie，只要把过期时间设置为现在
  }
  Response.AppendCookie(cok);
  }
  }