public Topology GetTopology()

{
    //Get the Topology of another Topology layer
    var existingTopology = MapView.Active.Map.GetLayersAsFlattenedList().OfType<TopologyLayer>().FirstOrDefault();
    if (existingTopology != null)
    {
        var topology = existingTopology.GetTopology();
        //Configure the settings for a new Catalog layer using the CatalogDataset of an existing layer
        var topologyLyrParams = new TopologyLayerCreationParams(topology);
        topologyLyrParams.Name = "NewTopologyLayerFromAnotherTopologyLayer";
        topologyLyrParams.AddAssociatedLayers = true;
        //Note: Needs QueuedTask to run
        LayerFactory.Instance.CreateLayer<TopologyLayer>(topologyLyrParams, MapView.Active.Map);
    }
}