When a shape is moved inside a drawing view, the diagram creates a clone of the shape and moves it inside the view. So you can try subscribing for the following event:

drawingView.EventSinkService.NodeBoundsChanged

It will get invoked when a shape is moved inside the view.

Best Regards,
Nevron Support Team

currently i have  4  shapes in my document.  those shapes are i dragged and  dropped on drawing document by dragging shapes from library Browser. now i selected one shape among the 4 shapes(in document) and i started moving it. now i need to generate a drag event when selected shape moving.