Constants returned by the MouseEvent.DragState property.
User is beginning to drag an object with the mouse.
User dropped the dragged object in the drop-target window.
User is dragging an object into the drop-target window with the mouse.
User is moving the mouse out of the drop-target window.
Either not a mouse movement or a mouse movement that is not a drag operation.
User is moving the dragged object within the drop-target window with the mouse.