//设置cookieResponse.Cookies["loginPage"].Value = "login.aspx";  //命名并给值Response.Cookies["loginPage"].Expires = DateTime.MaxValue;  //时间为最大//读取cookiestring logout = Request.Cookies["loginPage"].Value.ToString();   //清除cookieResponse.Cookies["loginPage"].Expires = DateTime.Now.AddDays(-1);    //相当于清除