All
Copy
The data from the drag source is copied to the drop target.
Link
The data from the drag source is linked to the drop target.
Move
The data from the drag source is moved to the drop target.
None
The drop target does not accept the data.
Begins a drag-and-drop operation.
Returns which drag-and-drop operations are allowed by the originator (or source) of the drag event.
Returns or sets the target drop effect in a drag-and-drop operation.