The NDragDrop static class manages the drag-and-drop virtual device in NOV and serves as UI event dispatcher for native drag-and-drop events, that a particular window peer receives. Following is a description of the drag-and-drop related features and services:

Event	Description	Event Arguments
Drag and Drop Action Events
NDragDrop.DragOver	Raised when the dragged data object is moved inside the current drag over target. The event is routed along the entire route from the target node to its root.	NDragActionEventArgs
NDragDrop.DragDrop	Raised when the user drops a data object inside the current drag over target. The event is routed along the entire route from the target node to its root.	NDragActionEventArgs
Drag Over Target Events
NDragDrop.DragEnterEvent	Raised when the dragged data object enters a new drag over target. Further Drag-And-Drop Action Events will be raised for the drag over target. The event is routed along the entire route from the target node to its root.	NDragOverChangeEventArgs
NDragDrop.DragInEvent	Raised after NDragDrop.DragEnterEvent, but routed up to the last ancestor that was common between the previous drag over target and the new one.	NDragOverChangeEventArgs
NDragDrop.DragOutEvent	Raised before NDragDrop.DragLeaveEvent, but routed up to the last ancestor that was common between the previous drag over target and the new one.	NDragOverChangeEventArgs
NDragDrop.DragLeaveEvent	Raised when the dragged data object leaves the current drag over target. The event is routed along the entire route from the target node to its root.	NDragOverChangeEventArgs

Property	Description
NDragDrop.DirectlyOverPropertyEx	Set to true for the input target over which the drag-drop is directly over.
NDragDrop.OverPropertyEx	Set to true for the input target over which the drag-drop is directly over and all of its ancestors.

Besides dispatching Drag-and-Drop events, the NDragDrop static class can also be used to initiate drag-and-drop operations. This is achieved by calling the NDragDrop.RequestDragDrop method. See Data Exchange Overview for more information. 

The NDragDrop also provides several methods for helping you obtain the current value of the extended properties that it has applied to a particular node. These are:

• NDragDrop.IsDirectlyOver(NNode node) – returns the current value of the NDragDrop.DirectlyOverPropertyEx extended property for the specified node.
• NDragDrop.IsOver (NNode node) – returns the current value of the NDragDrop.OverPropertyEx extended property for the specified node.