Silverlight Navigation: How to remember page state?

I'm not sure how to preserve page state in Silverlight 4.

I have a page called SearchPage. The user comes to it with a query, but the query may change while the user is ther开发者_开发问答e. If the user goes back, I'd like the most recent version of the query to be retained, not the original one.

To do this, I overrode OnFavigatedFrom() and changed NavigationContext.QueryString to reflect the new values. Then, in OnNavigatedTo(), I check for those values.

Unfortunately, this doesn't work. It appears that I can't change the query string, because when I call navigator.GoBack(), it goes back to the original query string.

What other way can I preserve page state?

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You can set the NavigationCacheMode property on the Page to Enabled or Required, which will cache and retain the page's state when it's navigated away from.