cookie的基本用法

写cookie

 HttpCookie UserCookie = new HttpCookie("userName"); 

 UserCookie["name"]=dr["user"].ToString();

UserCookie.Expires=DateTime.Now.AddDays(1);//这里设置要保存多长时间.
 Response.Cookies.Add(UserCookie);
 

读取cookie

HttpCookie cookie=Request.Cookies["userName"];

string name=cookie.Values["name"];

清除cookie

 

HttpCookie cookie=Request.Cookies["userName"];

   if(cookie!=null)

   {

    cookie.Expires=DateTime.Now.AddDays(-2);    

    Response.Cookies.Set(cookie);

   }