Detecting which page opened current page, how?

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ASP.NET 2.0

In my webproject I've created a page which contain a button. This page will
be opened from 2 pages. This button must be invisible if the page it is
placed on are opened from one of the 2 pages, When opened from the other
page then it will be visible.

So how do I know when to make this button invisible?

I've tryed to set another parameter in the URL (GET), I added this to the
URL &mode=0, which works great. But somehow I don't like it. It gives the
user the impression that he can try mode=1 (which will change the content of
the page)...

Isn't there another way of doing it by using for example the Request class.
Doesn't it contain info about what page called current page? I'm not sure
about this!...

Any suggestions?

Jeff


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