This class encapsulates the data for the PropertyGrid.SelectedGridItemChanged event. You can retrieve both the OldSelection and the NewSelection.

public class SelectedGridItemChangedEventArgs : EventArgs {
// Public Constructors
   public SelectedGridItemChangedEventArgs(GridItem oldSel, GridItem newSel);
// Public Instance Properties
   public GridItem NewSelection{get; }
   public GridItem OldSelection{get; }
}

Hierarchy

System.Object System.EventArgs SelectedGridItemChangedEventArgs

Passed To

PropertyGrid.OnSelectedGridItemChanged(), SelectedGridItemChangedEventHandler.{BeginInvoke(), Invoke()}