Hi venkata,
That was a good question. In Windows Store App the basic idea to view PDF is to generate a bitmap for the current page by
GetPage | getPage method.
Each time you generate a new page, the page number you should be able to keep in your backend and save it as bookmark also when your user quit the app, save the page number.
If you would like to put all pages into ScrollViewer, I think the best practice is to calculate the ScrollViewer's scroll position, then you should be able to know where is the current page.
--James
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