使用FormsAuthentication持久cookie超时

FormsAuthenticationTicket ticket = new FormsAuthenticationTicket(
    1,                                  // version
    userName,                            // user name
    DateTime.Now,                        // creation
    DateTime.Now.AddMinutes(30),         // expiration
    true,                                // persistent
    userData,                            // user data
    FormsAuthentication.FormsCookiePath // cookie path
);

HttpCookie cookie = new HttpCookie("name", "value");
cookie.Domain = ".example.com"; // set the domain to example.com and all subdomains
Response.Cookies.Add(cookie);