Where to keep a querystring parameter in session?
<p>Users will get to my site using a specific parameter, e.g. :
<a href="http://www.mysite.com/whatever/?keepTrackOfThisValue=foo" rel="nofollow">http://www.mysite.com/whatever/?keepTrackOfThisValue=foo</a>
or
<a href="http://www.mysite.com/who/cares/?keepTrackOfThisValue=bar" rel="nofollow">http://www.mysite.com/who/cares/?keepTrackOfThisValue=bar</a></p>

<p>I would like to store the value of this peculiar parameter in Session everytime I found it in the QueryString. I'm currently using the Session_Start event in Global.asax in order to store this but I would like to override the value each time the parameter value change, which is not possible my way.</p>

<p>Where would you do this ?</p>
