I want to have a page that collects information from the user, and i want to take that information and use it on other pages and classes

Question

Is it necessary to store this to a file and isolated storage, or is there another way to do it?

Answer 1

No, you do not have to. You can place common data in your 'application', which will be accessible everywhere via the Application.Current property. Alternatively, if you use the MVVM pattern, you can set the DataContext of the RootFrame, this will ensure that all pages shares the same data context.

See this blog post I wrote for a nice simple MVVM WP7 example.