When a page is requested by an Internet Explorer 5 browser, 
or later, smart navigation enhances the user's experience 
of the page by performing the following:

    * eliminating the flash caused by navigation.
    * persisting the scroll position when moving from page 
to page.
    * persisting element focus between navigations.
    * retaining only the last page state in the browser's 
history.

Smart navigation is best used with ASP.NET pages that 
require frequent postbacks but with visual content that 
does not change dramatically on return. Consider this 
carefully when deciding whether to set this property to 
true.
Set the SmartNavigation attribute to true in the @ Page 
directive in the .aspx file. When the page is requested, 
the dynamically generated class sets this property.