ArcGIS Pro 2.6 API Reference Guide
Wkid Property (GeographicTransformationListEntry)
Example 

ArcGIS.Core.Geometry Namespace > GeographicTransformationListEntry Class : Wkid Property
Gets the well-known ID of the geographic transformation.
Syntax
public int Wkid {get;}
Public ReadOnly Property Wkid As Integer
Example
// a geographic transformation is the definition of how to project from one spatial reference to another
IReadOnlyList<GeographicTransformationListEntry> list = GeometryEngine.Instance.GetPredefinedGeographicTransformationList();

// a GeographicTransformationListEntry consists of Name, Wkid, the From SpatialReference Wkid, the To SpatialReference Wkid
GeographicTransformationListEntry entry = list[0];

int fromWkid = entry.FromSRWkid;
int toWkid = entry.ToSRWkid;
int wkid = entry.Wkid;
string name = entry.Name;
Requirements

Target Platforms: Windows 10, Windows 8.1, Windows 7

See Also

Reference

GeographicTransformationListEntry Class
GeographicTransformationListEntry Members