public static Task<List<FeatureLayer>> GetHistoricParcelLineLayerByTypeNameAsync( 
   ParcelLayer parcelLayer,
   string typeName
)

{
  var theparcelTypeName = await QueuedTask.Run(async () =>
  {
    IEnumerable<string> parcelTypeNames = await myParcelFabricLayer.GetParcelTypeNamesAsync();
    foreach (string parcelTypeName in parcelTypeNames)
    {
      if (geomType == GeometryType.Polygon)
      {
        var polygonLyrParcelTypeEnum = await myParcelFabricLayer.GetParcelPolygonLayerByTypeNameAsync(parcelTypeName);
        foreach (FeatureLayer lyr in polygonLyrParcelTypeEnum)
          if (lyr == featLayer)
            return parcelTypeName;

        polygonLyrParcelTypeEnum = await myParcelFabricLayer.GetHistoricParcelPolygonLayerByTypeNameAsync(parcelTypeName);
        foreach (FeatureLayer lyr in polygonLyrParcelTypeEnum)
          if (lyr == featLayer)
            return parcelTypeName;
      }
      if (geomType == GeometryType.Polyline)
      {
        var lineLyrParcelTypeEnum = await myParcelFabricLayer.GetParcelLineLayerByTypeNameAsync(parcelTypeName);
        foreach (FeatureLayer lyr in lineLyrParcelTypeEnum)
          if (lyr == featLayer)
            return parcelTypeName;

        lineLyrParcelTypeEnum = await myParcelFabricLayer.GetHistoricParcelLineLayerByTypeNameAsync(parcelTypeName);
        foreach (FeatureLayer lyr in lineLyrParcelTypeEnum)
          if (lyr == featLayer)
            return parcelTypeName;
      }
    }
    return String.Empty;
  });
}