Accessing the Profile class from a VB.Net/VS.Net 2008 Web App

I am using VB.Net/ASP.Net 2008/3.5 to create a Web Application and I am trying to access the Profile Class.
I notice that unlike a "Website" that you cannot access the Profile class from a "Web Application" and I was wondering what is the best way of adding the Profile class to a Web application?
thanks
MC 
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