// Create from wkid
HVDatumTransformation hv110018 = HVDatumTransformation.Create(110018);
int wkid = hv110018.Wkid;
bool isForward = hv110018.IsForward; // isForward = true
string name = hv110018.Name; // Name = WGS_1984_To_WGS_1984_EGM2008_1x1_Height
// Create from wkt
string wkt = hv110018.Wkt;
HVDatumTransformation hv110018FromWkt = HVDatumTransformation.Create(wkt);
// Get the inverse
HVDatumTransformation hv110018Inverse =
hv110018.GetInverse() as HVDatumTransformation;
// hv110018Inverse.IsForward = false