Using Programming Languages other than VBA

Private Sub AcadDocument_ObjectModified(ByVal Object As Object)
    ' This example intercepts a drawing ObjectModified event.
    '
    ' This event is triggered when an object in a drawing is modified.
    '
    ' To trigger this example event: Modify an object in any open drawing

    ' Use the "Object" variable to determine the type of object modified
    MsgBox "A " & TypeName(Object) & " was just modified!"
End Sub