I'll try that, but where is the PerformSelect method? I will not get the PerformSelect event from the data source because LivePersistence is on.

protected void RoleDsOnPerformSelect(object sender, PerformSelectEventArgs2 performSelectEventArgs2) {
  while (performSelectEventArgs2.Sorter.Count > 0) {
    performSelectEventArgs2.Sorter.Remove(performSelectEventArgs2.Sorter[0]);
  }
  foreach (ISortClause sortClause in SorterToUse) {
    performSelectEventArgs2.Sorter.Add(sortClause);
  }
}

Yes, LivePersistence has to be switched off, unfortunately. It's not a big deal though, in general the method contents of the event handlers are straight forward.

We have many view-only DataSource/GridView pages with LivePersistence turned off. This is not an issue in that mode because PerformSelect allows us to pass our own filter and sort.

protected void UserDsPerformSelect(object sender, PerformSelectEventArgs2 e) {
  using (var adapter = UnitOfDbWork.DataAccessAdapter) {
    adapter.FetchEntityCollection(e.ContainedCollection, FilterToUse, e.MaxNumberOfItemsToReturn, SorterToUse, e.PrefetchPath, e.PageNumber, e.PageSize);
  }
}

We'll just turn LivePersistence off also for this page then and do our own db CRUD.