When I logout it still login and when I back it still login

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When i logout from asp.net page but it still login ,if i copy link in new tab after logout it still login , also after logout if i press back button of browser it still show login,
i need help. i add the code of logout page also plz help

What I have tried:

public partial class logout : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
                Session.Clear();


                Session.Abandon();
                Response.Cache.SetCacheability(HttpCacheability.NoCache);
                FormsAuthentication.SignOut();
                Session.Remove("LOGINNAME");
                Session.Remove("LOGINPASSWORD");
                Session.Remove("Index");
                Session.Remove("Default");
                Session.Remove("logout");
                Session.Contents.RemoveAll();
                Session.RemoveAll();
                Cache.Remove("LOGINNAME");
                Cache.Remove("LOGINPASSWORD");
                Cache.Remove("AGENTID");

                Response.Cache.SetNoStore();
                Response.Cache.SetNoServerCaching();

                Response.Expires = -1;
                Session.Timeout=1;
                Response.Redirect("Default.aspx", true);
                Response.Flush();
                

            }
        }

Posted 16-Aug-17 19:12pm

Ahsan Aijaz

Updated 16-Aug-17 20:50pm

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Comments

Richard Deeming 17-Aug-17 10:18am

Session.Remove("LOGINNAME");
Session.Remove("LOGINPASSWORD");

You're using Forms authentication, so there's no need to store the username anywhere else. And you should NEVER store the password in memory, or in a cookie.

That also makes me suspect that you might be storing the password in the database in plain text, which is a serious security failure.

Secure Password Authentication Explained Simply[^]
Salted Password Hashing - Doing it Right[^]

Cache.Remove("LOGINNAME");
Cache.Remove("LOGINPASSWORD");
Cache.Remove("AGENTID");

The Cache is global to your application, not to a specific user. If you're storing user-specific details in the Cache, then you're in for some serious bugs once multiple users are using your application at the same time!

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Prifti Constantine · Accepted Answer · 2017-08-16T20:50:00

One problem could be the :

C#

Response.Redirect("Default.aspx", true);

since when you give the value true to the Response.Redirect
nothing bellow that specific line of code will be executed....
In order to execute the

C#

Response.Flush

you have to
assign the value false in order to also check for any lines of code beneath
the Response.Redirect.

You could also try to use

C#

Response.End

instead of Response.Flush...
This way the

C#

EndRequest

will be triggered..