【Asp.Net】：CookieDemo

1.判断所需cookie是否存在，新建1个cookie判断其是否指向null

2.删除cookie的方法为设置保存时间为-1,并将其加入Respond.Cookies列表中

protected void Page_Load(object sender, EventArgs e)
    {
        HttpCookie cookie=Request.Cookies["name"];//获取客户端Cookie
        if (cookie == null)//如果不存在该名称的Cookie
        {
            cookie = new HttpCookie("name", "zhoufoxcn");
            cookie.Expires = DateTime.Now.AddDays(10);//设置cookie保存10天
            Response.Cookies.Add(cookie);//将cookie发送到客户端保存
        }
        else
        {
            Response.Write("cookie中保存的数据是：" + cookie.Value);
            cookie.Expires = DateTime.Now.AddYears(-1);
            Response.Cookies.Add(cookie);//将cookie发送到客户端，这样就能删除掉cookie
        }
    }