Problem clearing browser cache from ASPX code

1 New Member

I am using this code for remove the cache of my browserin my aspx page:

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<% System.Web.HttpContext.Current.Response.AddHeader( "Cache-Control","no-cache");

System.Web.HttpContext.Current.Response.Expires = 0;

System.Web.HttpContext.Current.Response.Cache.SetNoStore();

System.Web.HttpContext.Current.Response.AddHeader("Pragma", "no-cache");%>

But in run time following error:

Description: An error occurred during the parsing of a resource required to service this request. Please review the following specific parse error details and modify your source file appropriately.

Parser Error Message: Code blocks are not allowed in this file.

Please help me on this.

Apr 12 '11 #1

Subscribe Reply

2585

Justin Ellison

New Member

First of all, browsers do not necessarily respect the caching headers, nor do ISPs who may also be caching the request. Your attempt to keep the page from being cached may ultimately not work; just something to keep in mind.

As for the error, a .NET page is a little different than pages were when using vbscript. I would suggest moving the code to an event on the page, particularly the "load" event. In this case your code might look like this:

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 <script runat="server">
 
protected void frmMain_Load(object sender, System.EventArgs e){
 
  System.Web.HttpContext.Current.Response.AddHeader( "Cache-Control","no-cache");

  System.Web.HttpContext.Current.Response.Expires = 0;

  System.Web.HttpContext.Current.Response.Cache.SetN oStore();

  System.Web.HttpContext.Current.Response.AddHeader( "Pragma", "no-cache");
 
}
 
</script>

Good luck.

Apr 12 '11 #2

Frinavale

9,735

Recognized Expert Moderator Expert

Justin Ellison's code will work.
But you don't need to write server-side code for this.
You can use meta tags to accomplish the same thing.

For example:

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<head>

  <meta http-equiv = "CACHE-CONTROL" content="NO-CACHE, must-revalidate, max-age=0" />

  <meta http-equiv = "expires" content = "0" />

  <meta http-equiv="Pragma" content="no-cache" />

</head>

Please listen to Justin Ellison's advice about how Browsers treat these meta tags...they are mostly ignored (except by IE).

The best way to avoid caching is to wrap the content of your pages in an UpdatePanel and use Ajax requests. The browser will cache the first time the page loads...after that nothing is cached. So, if the person leaves the page and hits the browser's back-button, the page will be displayed as if it were the first time the person had visited.

-Frinny

Apr 12 '11 #3

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