Posted 30 Jan 2013 Link to this post
Posted 31 Jan 2013 Link to this post
You could subscribe for the DistinctValuesLoading event of the RadGridView and load just the values you would like to. This help article may be helpful as an example.
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void
CodeBehindHook_DistinctValuesLoading(
object
sender, Telerik.Windows.Controls.GridView.GridViewDistinctValuesLoadingEventArgs e)
{
var filterItems = ((Telerik.Windows.Controls.RadGridView)sender).GetDistinctValues(e.Column,
false
);
e.ItemsSource = filterItems.Cast<
decimal
?>().Where(itm => itm.HasValue);
}