Another option for loading pages as the user scrolls vertically is the AllowVirtualScrollPaging property. This can be used instead of the allow load on demand properties. The virtual paging will not work with load on demand. The EnableClientScript property must be true for the virtual paging. For the best performance, you may also wish to set EnableAjaxCall to true since the virtual paging uses Ajax calls.

The virtual scrolling option scrolls from the first row to the last row of the page size. If the row count is greater than the page size, then when you scroll past the maximum page size row, the next set of rows is loaded (a wait icon is displayed while the next page is loading in this case).

The scroll bar button size reflects the total number of rows with virtual scrolling (rather than the number of currently loaded rows).