For any body that's interested I have found a solution to this problem
that works for me.
What I do is use javascript to detect whether the close button has been
clicked on the browser and launch a pop-up window, which populates my
database and ends my session if it has. The basic code is here;
//This Code goes in the page_load event for each page in the
application. This code is just registering the javascript.
if(!this.IsClie ntScriptBlockRe gistered("clien tScript"))
this.Page.Regis terClientScript Block("clientSc ript",strScript );
//This code goes in the Body html tag of each page in the application
<Body onunload="logof f('logout.aspx' )">
//This is the javascript to check for the browser close button and open
a log-off
//pop-up window (strScript in the example above).
//You can type this javascript directly into the html of each page and
it has
//the same effect, but there is less manipulation involved if you store
it in a class.
//The important bit is "if (event.clientY < 0)", becuase this
determines whether or not
//the close (x) button has been clicked, by looking at the mouse
pointer location.
<script language=javasc ript>
<!--
var newwindow = ''
function logoff(url)
{
if (event.clientY < 0)
{
if (!newwindow.clo sed && newwindow.locat ion)
{
newwindow.locat ion.href = url;
}
else
{
newwindow=windo w.open(url,'Log out','height=15 0,width=100');
if (!newwindow.ope ner) newwindow.opene r = self;
}
}
if (window.focus)
{
newwindow.focus ()
}
return false;
}
// -->
</script>
//This is the code on the Page_Load event of logoff.aspx. In this
example I
//use Session["strUserID"] to determine whether or
//not the user has logged in to the web-site, as this is optional. The
pop-up window
//closes automatically if the user has not logged in.
//I have a call to a function which populates my database log info here
first, then;
if((string)Sess ion["strUserID"] == "")
{
Page.RegisterSt artupScript("Cl oseScript","<sc ript language=javasc ript>
window.close(); </script>");
}
else
{
lblMessage.Text = "<p align=center>Br ands Manual<br><br>L ogout
Successful<br>< br><a
href='javascrip t:window.close( )'>Close</a></font>";
}
Session.Abandon ();
