Selecting and deselecting a range of rows

// SelItemRange - Selects/Deselect a range of items
// Returns              - The number of new items selected
// bSelect              - TRUE to select, FALSE to deselect
// nFirstItem           - index of first item to select
// nLastItem            - index of last item to select
int CMyListCtrl::SelItemRange(BOOL bSelect, int nFirstItem, int nLastItem)
{
        // make sure nFirstItem and nLastItem are valid
        if( nFirstItem >= GetItemCount() || nLastItem >= GetItemCount() )
                return 0;

        int nItemsSelected = 0;
        int nFlags = bSelect ? 0 : LVNI_SELECTED;
        int nItem = nFirstItem - 1;
        while( (nItem = GetNextItem( nItem, nFlags )) >=0
                        && nItem <= nLastItem )
        {
                nItemsSelected++;
                SetItemState(nItem, bSelect ? LVIS_SELECTED : 0, LVIS_SELECTED );
        }
        return nItemsSelected;
}