asp.net mvc - Cookie is not delete in mvc(c#) -

i want make login , logout functions in mvc4. in login func, if login cookie exist , not empty, user in signin mode, else redirect login page. in logout func, cookies , sessions clear , redirect login func, in login func login cookie exist!

login:

public actionresult login()         {             if (request.cookies["login"] != null)             {                 string login = request.cookies["login"].value.tostring();                                  if (login != string.empty)                 {                     //get service                     service srv = new service();                     useritem useritem = srv.getuseritem(login);                                         srv.close();                      session.timeout = 30;                     session["login "] = login;                     session["userid"] = useritem.no;                     session["firstname"] = useritem.firstname;                     session["lastname"] = useritem.lastname;                     string loginname = useritem.loginname;                                          formsauthentication.setauthcookie(loginname, false);                      return redirect(“index”);                 }                 else                  {                     return redirect("http://mysite/signin.aspx");                 }             }             else             {                 return redirect("http://mysite/signin.aspx");                                 }         } 

logout:

public actionresult logout()         {             string login = session["login"].tostring();              request.cookies["login"].value = "";             response.cookies["login"].value = "";              formsauthentication.signout();             httpcookie c = request.cookies[formsauthentication.formscookiename];             c.expires = datetime.now.adddays(-1);              session.clear();             request.cookies.clear();             response.cookies.clear();              //formsauthentication.initialize();             //string strrole = string.empty;             //formsauthenticationticket fat = new formsauthenticationticket(1, "", datetime.now, datetime.now.addminutes(-30), false, strrole, formsauthentication.formscookiepath);             //response.cookies.add(new httpcookie(formsauthentication.formscookiename, formsauthentication.encrypt(fat)));              //session.abandon();              //// clear authentication cookie             //httpcookie cookie1 = new httpcookie(formsauthentication.formscookiename, "");             //cookie1.expires = datetime.now.addyears(-1);             //response.cookies.add(cookie1);              //// clear session cookie (not necessary current problem recommend anyway)             //httpcookie cookie2 = new httpcookie("asp.net_sessionid", "");             //cookie2.expires = datetime.now.addyears(-1);             //response.cookies.add(cookie2);              //formsauthentication.redirecttologinpage();                             return redirecttoaction("login", "usr");         } 

web.config:

<authentication mode="forms">       <forms loginurl="~/usr/login" timeout="30" />     </authentication> 

i trying comment codes, comment line:

formsauthentication.signout(); 

even set cookie value "", in login page cookie have old value! , trying several ways clear cookie set expire 1 day later. but…

thanks

you're changing value of cookie, you're not adding response again!

formsauthentication.signout(); httpcookie c = request.cookies[formsauthentication.formscookiename]; c.expires = datetime.now.adddays(-1);  // update amended cookie! response.cookies.set(c)  session.clear(); /* rid of this, break above clearing  * cookie collection you've updated. */ // request.cookies.clear(); // response.cookies.clear();