ArcGIS Pro 3.4 API Reference Guide
ArcGIS.Desktop.Editing.Controls Namespace / TableControl Class / ActiveObjectId Property
Version

ActiveObjectId Property (TableControl)
Gets the ObjectID of the active row in the table. The value of the row can be null, when the table does not have object ids, the active row is the new row, or the data for the row has not been loaded.
Syntax
public Nullable<long> ActiveObjectId {get;}
Requirements

Target Platforms: Windows 11, Windows 10

ArcGIS Pro version: 3.1 or higher.
See Also