COOKIE的使用

COOKIE的写入：
DateTime dt=DateTime.Now;     //需要<%@Import Namespace="System"%>，得到当前时间
HttpCookie mycookie=new HttpCookie("logname");      //申明新的COOKIE变量
mycookie.Value="aa";                                                          //赋值
mycookie.Expires=Convert.ToDateTime(dt+TimeSpan.FromDays(1));       //设定过期时间为1天
Response.Cookies.Add(mycookie);                            //写入COOKIE 

COOKIE的读取：
HttpCookie mycookie=Request.Cookies["username"];
string username=mycookie.Value;