Crystal Reports: Navigation in ASP.NET

I created a general purpose ASP.NET page for rendering all of my Crystal Reports. This aspx page has a simple toolbar for setting a date range for the report and selections for output type (HTML, Acrobat (PDF), Excel (XLS)). Some time after developing this page I realized that navigating through a multi-page report was not working -- every time I would navigate (using Crystal's toolbar), I would end up on page 1.
To resolve this problem, I only had to make slight modifications: detect the navigation event & skip a bit of code during navigation.

On the page's PreRender event:

• Load the Report Document (.rpt)
• If not navigating (use CRV's Navigate event & set flag>...
  • Set the date range info on the Report Doc
• Set CRV.ReportSource to the Report Doc
• And, of course, call base.OnPreRender to give CRV it's opportunity to do prerender processing

The primary issue of the viewer always rendering page 1 was caused by setting the date info again.