On Page_Load the items of the RadListView might not be available. You can handle the RadListView PreRender event instead. There check if the current item is desired. If not, change the RadDataPager current page index and rebind the RadListView. Then again you need to check if the item is the desired one and so on till you get to the suitable page and item.
Another option is to find which is the desired item directly in the RadListView data source and based on that calculate on which page will it go. Thus you can directly change the current page index to the proper one with only one rebinding of the RadListView.
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