C# 清除coockies

if (Request.Cookies["zxcookies"] != null)
        {
            HttpCookie mycookie;
            mycookie = Request.Cookies["zxcookies"];
            TimeSpan ts = new TimeSpan(0, 0, 0, 0);//时间跨度
mycookie.Expires = DateTime.Now.Add(ts);//立即过期
            Response.Cookies.Remove("zxcookies");//清除
            Response.Cookies.Add(mycookie);//写入立即过期的*/
            Response.Cookies["zxcookies"].Expires =DateTime.Now.AddDays(-1);
}