ArcGIS Pro 2.7 API Reference Guide
IDropTarget Interface
Members 

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

Target Platforms: Windows 10, Windows 8.1

See Also

Reference

IDropTarget Members
ArcGIS.Desktop.Framework.DragDrop Namespace