谈Response.AppendCookie的使用方法 (2)

    }
    //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);
        }
    }