How to clear browser cache when user log off in asp.net using c#?

Question

As new in asp.net. In my asp.net application in membership in log off on click event using function ClearSession(), but problem arises after log off if i click back button on browser it is forwarding to the cached page. How to clear cache in browser so a user could not view its profile if he is not login

protected void ClearSession()
{
    FormsAuthentication.SignOut();
    Session.Clear();
    Response.Cache.SetCacheability(HttpCacheability.NoCache);
    Response.ExpiresAbsolute = DateTime.UtcNow.AddDays(-1d);
    Response.Expires = -1500;
    Response.CacheControl = "no-Cache";
}

Note that you can't "clear browser cache" from either server of client portion of your page and you can't configure browser's behavior (you can advice browser about caching but not force). So if you are concerned about pages staying on user's machine you are really out of luck. — Alexei Levenkov
– Alexei Levenkov, Commented Mar 10, 2014 at 16:49
Possible duplicate of Making sure a web page is not cached, across all browsers — BalusC
– BalusC, Commented Jan 4, 2016 at 11:54

Community · Accepted Answer · 2017-05-23 12:04:02Z

11

I think you are almost there. You need more HTML headers to support all browsers. According to this article on SO these are the ones that work on all browsers:

Cache-Control: no-cache, no-store, must-revalidate
Pragma: no-cache
Expires: 0

The full code for this is:

HttpContext.Current.Response.AddHeader("Cache-Control", "no-cache, no-store, must-revalidate");
HttpContext.Current.Response.AddHeader("Pragma", "no-cache");
HttpContext.Current.Response.AddHeader("Expires", "0");

edited May 23, 2017 at 12:04

CommunityBot

11 silver badge

answered Mar 10, 2014 at 16:44

Patrick Hofman

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humanshu · Accepted Answer · 2015-06-30 13:09:24Z

0

response.setHeader("Cache-Control", "no-cache, no-store, must-revalidate");
response.setHeader("Pragma", "no-cache"); 
response.setDateHeader("Expires", 0);

These header will only work on pages on which they are included not for all the web application, so either you should add filter which include this header to all pages or you can disable back button.

answered Jun 30, 2015 at 13:09

humanshu

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