cookie的使用

1. HttpCookie cookie = new HttpCookie("username");  //新建cookie
2. cookie.Value = HttpUtility.UrlEncode("李四",Encoding.GetEncoding("UTF=8")); //转码
   
3. cookie.Expires = DateTime.Now.AddDays(1);//设置过期时间
   
4.  Response.Cookies.Add(cookie);  //存放cookie