I think I saw your problem once earlier at the Telerik forum:
http://www.telerik.com/community/forums/winforms/gridview/radgridview-refresh-problem.aspx
you must implement INotifyPropertyChanged interface
Domanda
How to refresh telerik grid view (winforms) using c#?
i tried :
gridview.datasource = null;
gridview.datasource = dataset;
Soluzione
I think I saw your problem once earlier at the Telerik forum:
http://www.telerik.com/community/forums/winforms/gridview/radgridview-refresh-problem.aspx
you must implement INotifyPropertyChanged interface