Hi,
>>I saw that Rick had also suggested your own HTTPHandler and I'm sure a handler factory is the ideal way to go - but you could just check the handler type and only pass the request to your framework if it's an ASPX page (or other type of interest).
>
>Yes, I would prefer that. But, even if I could find a way to have this GetType() working in VB.NET, by only passing an aspx page to the framework, I would still have the problem of the Redirect not being applicable to the PreRequestHandlerExecute() event.
>>
For the GetType() problem try something like:

Dim o As Object = Context.Handler
Dim h As Object = o.GetType()

Anyway, here's a link to simple creation of custom httphandlers (and factories):
http://msdn2.microsoft.com/en-us/library/ms227439(d=ide).aspx

HTH,
Viv