public sealed class LasDataset : ArcGIS.Core.Data.Dataset, System.IDisposable  

{
  //Note: Use QueuedTask.Run to run on the MCT 

  string path = @"d:\Data\LASDataset";
  var fileConnection = new FileSystemConnectionPath(new Uri(path), FileSystemDatastoreType.LasDataset);

  using (FileSystemDatastore dataStore = new FileSystemDatastore(fileConnection))
  {
    string name = "utrecht_tile.lasd";      // can specify with or without the .lasd extension

    using (var dataset = dataStore.OpenDataset<ArcGIS.Core.Data.Analyst3D.LasDataset>(name))
    {

    }
  }
}

{
  //Note: Needs QueuedTask to run
  {
    using (var tin = tinLayer.GetTinDataset())
    {
      using var tinDef = tin.GetDefinition();
      Envelope extent = tinDef.GetExtent();
      SpatialReference sr = tinDef.GetSpatialReference();
    }

    using (terrain = terrainLayer.GetTerrain())
    {
      using var terrainDef = terrain.GetDefinition();
      Envelope extent = terrainDef.GetExtent();
      SpatialReference sr = terrainDef.GetSpatialReference();
    }

    using (lasDataset = lasDatasetLayer.GetLasDataset())
    {
      using var lasDatasetDef = lasDataset.GetDefinition();
      Envelope extent = lasDatasetDef.GetExtent();
      SpatialReference sr = lasDatasetDef.GetSpatialReference();
    }
  }
}

{
  if (lasDataset == null)
    throw new ArgumentNullException(nameof(lasDataset));

  var lasCP_ds = new LasDatasetLayerCreationParams(lasDataset);
  lasCP_ds.Name = "My LAS Layer";
  lasCP_ds.IsVisible = false;
  // Note: Needs QueuedTask to run
  {
    //Create the layer to the LAS dataset
    var lasDatasetLayer_ds = LayerFactory.Instance.CreateLayer<LasDatasetLayer>(lasCP_ds, map);
  }
}

{
  var lasCP_renderers = new LasDatasetLayerCreationParams(lasDataset);
  lasCP_renderers.Name = "My LAS Layer";
  lasCP_renderers.IsVisible = false;

  // create a point elevation renderer
  var ptR = new LasStretchRendererDefinition();
  // accept all defaults

  // create a simple edge renderer
  var edgeR = new TinEdgeRendererDefintion();
  // accept all defaults

  // add renderers to dictionary
  var l_dict = new Dictionary<SurfaceRendererTarget, TinRendererDefinition>();
  l_dict.Add(SurfaceRendererTarget.Points, ptR);
  l_dict.Add(SurfaceRendererTarget.Edges, edgeR);

  // assign dictionary to creation params
  lasCP_renderers.RendererDefinitions = l_dict;
  // Note: Needs QueuedTask to run
  {
    //Create the layer to the LAS dataset
    var lasDatasetLayer_rd = LayerFactory.Instance.CreateLayer<LasDatasetLayer>(lasCP_renderers, map);
  }
}