Gets whether all rows displayed within a page have been selected or unselected.
true if all rows displayed within a page have been selected or unselected; otherwise, false.
If the selection has been changed on the server (the ASPxClientGridViewSelectionEventArgs.isChangedOnServer property returns true) the isAllRecordsOnPage property is not in effect. It returns false in any case. To learn more, see the ASPxClientGridView.SelectionChanged event description.