public IReadOnlyList<GeographicTransformationListEntry> GetPredefinedGeographicTransformationList()

{
  // 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;
}