Re: querystring and going back in browser

From: Rocky Moore (gRockyMoore_at_hintsandtips.com)
Date: 02/01/04 

Date: Sun, 1 Feb 2004 02:21:11 -0800

If you have a button, why not user a server control like linkbutton or a
button and grab the onClick in your code behind. Then when they click it,
you could have a field somewhere on the screen that you would update saying
it has been added.

Since it is not passed in a querystring as you have been processing it, you
would only need to process in the OnClick which is only triggered if it is a
postback event. 

-- 
Rocky Moore
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"tony collier" <melakka@hotmail.com> wrote in message
news:Xns94813CB51441Emelakkahotmailcom@194.117.133.134...
> Hi all
>
> I have a shopping cart which I have had to use querystrings to
> add/remove items rather than a form.  for example, i have a page with a
> list of items and next to each one is a button which when clicked refers
> to the same page with a different querystring item=12, item=33 etc.
>
> My pageload routine then checks for any query strings and if it finds an
> item value, adds this to the respective session variable.
>
> My problem is that if a client adds an item, goes to checkout or any
> other page for that matter, then decides to go back in the browser to
> the itemlist page, the item gets added again because the querystring is
> reloaded along with the page.
>
> Any ideas how I can make sure that items are only added/removed when the
> referrer is the same page?
>
> thanks.