When Infragistics UltraWebGrid is not in LoadOnDemand mode, you need to rebind the grid to the data source in PageIndexChanged event for paging to work. What’s neat – before the rebind, grid is still on the old page, effectively giving you “BeforePageIndexChanged” or “PageIndexChanging” event in server-side code:

Protected Sub xuwgGrid_PageIndexChanged(sender As Object, e As UltraWebGrid.PageEventArgs) Handles xuwgGrid.PageIndexChanged

   'Page hasn't changed yet, collect data from the old page
   'Or cancel the rebind and remain on the old page

   'rebinding the grid to the datasource
    BindGrid()

   'New page is in effect

End Sub