every developer face .
Why browser caching ?
To speed up user experience on the web, most browsers implement a technology called caching. Caching allows information such as WebPages, images, and so on, to be saved on a user’s computer. If the user calls for a previously requested webpage, the browser is able to access the information more quickly by recalling it from a cache, rather than making another request to the site itself.
One side it is a advantage but when you display sensitive information it will be a big drawback .Recently we have found one problem in our current project .that is when user log in and after some operations sing out .if user click on back button it is still displaying logged in user .Hmmm..... We have tried different ways to handle the issue .But we have faced issues with Firefox .
So i have decided to write logic in master page load event .And i have added some login in logout page .Here is the code.
Place this code in master page in load event
HttpContext.Current.Response.Cache.SetAllowResponseInBrowserHistory(false); HttpContext.Current.Response.Cache.SetCacheability(HttpCacheability.NoCache);
HttpContext.Current.Response.Cache.SetNoStore();
Response.Cache.SetExpires(DateTime.Now.AddSeconds(60));
Response.Cache.SetValidUntilExpires(true);In Logout page Load add this code
Response.AddHeader("Pragma", "no-cache");
Response.CacheControl = "no-cache"; Response.Cache.SetAllowResponseInBrowserHistory(false);Response.Cache.SetCacheability(HttpCacheability.NoCache);
Response.Cache.SetNoStore();
Response.Expires = -1;
Session.Abandon();
ClientScript.RegisterClientScriptBlock(this.GetType(),"signout", "DisableHistory()", true );
write this code in logout mark up page
function DisableHistory() {window.history.forward(1);
}
function RedirectToHome() { setTimeout("window.location = 'Index.aspx'",0);}
</script>
call this RedirectToHome method in body onload of logout page
<body onload ="RedirectToHome();">Run the application.Have a fun …
Great, I never knew this, thanks.
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