public override DatumTransformation GetInverse()

{
  // create from wkid
  GeographicTransformation gt1478 =
    ArcGIS.Core.Geometry.GeographicTransformation.Create(1478);
  string name = gt1478.Name;
  string wkt = gt1478.Wkt;
  int wkid = gt1478.Wkid;

  // create from wkt
  GeographicTransformation another_gt1478 =
       ArcGIS.Core.Geometry.GeographicTransformation.Create(wkt);

  // inverse
  GeographicTransformation inverse_gt148 =
                 another_gt1478.GetInverse() as GeographicTransformation;
  bool isForward = inverse_gt148.IsForward;
}