I guess you mean the DragEventArgs of the DragDropManager's Drop event. If so, you can get the object that holds the information about the dragged treeview item from the TreeViewDragDropOptions
var options = DragDropPayloadManager.GetDataFromObject(e.Data, TreeViewDragDropOptions.Key)
The options' object also contains information about the drop target
In addition you can take a look at the Drag and Drop
help article which describes the drag/drop functionality of RadTreeView. Also, you can take a look at the DragDropPayloadManager
article that describes how to extract the DragEventArgs.Data object.
I hope this information is useful.
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