ArcGIS Pro 2.8 API Reference Guide
IDragSource Interface
Members 

ArcGIS.Desktop.Framework.DragDrop Namespace : IDragSource Interface
Definition of a drag handler.
Syntax
public interface IDragSource 
Public Interface IDragSource 
Remarks
All drag handlers must implement this interface.
Requirements

Target Platforms: Windows 10, Windows 8.1

See Also

Reference

IDragSource Members
ArcGIS.Desktop.Framework.DragDrop Namespace