public string MapFrameName {get; set;}

{
  //Create a legend for an associated map frame.
  //Note: Must be on QueuedTask.Run

  //Build 2D envelope geometry
  Coordinate2D leg_ll = new Coordinate2D(6, 2.5);
  Coordinate2D leg_ur = new Coordinate2D(8, 4.5);
  Envelope leg_env = EnvelopeBuilderEx.CreateEnvelope(leg_ll, leg_ur);

  //Reference MF, create legend and add to layout
  mapFrame = layout.FindElement("New Map Frame") as MapFrame;
  if (mapFrame == null)
  {
    //TODO handle null map frame
    return;
  }
  var legendInfo = new LegendInfo()
  {
    MapFrameName = mapFrame.Name
  };
  Legend legendElm = ElementFactory.Instance.CreateMapSurroundElement(
                      layout, leg_env, legendInfo, "New Legend") as Legend;
}

{
  //Create a table frame.
  //Note: Must be on QueuedTask.Run

  //Build 2D envelope geometry
  Coordinate2D rec_ll = new Coordinate2D(1.0, 3.5);
  Coordinate2D rec_ur = new Coordinate2D(7.5, 4.5);
  Envelope rec_env = EnvelopeBuilderEx.CreateEnvelope(rec_ll, rec_ur);

  //Reference map frame and layer
  MapFrame mf = layout.FindElement("Map Frame") as MapFrame;
  FeatureLayer lyr = mf.Map.FindLayers("GreatLakes").First() as FeatureLayer;

  //Build fields list
  var fields = new[] { "NAME", "Shape_Area", "Shape_Length" };

  //Construct the table frame

  var tableFrameInfo = new TableFrameInfo()
  {
    FieldNames = fields,
    MapFrameName = mf.Name,
    MapMemberUri = lyr.URI
  };
  var tabFrame = ElementFactory.Instance.CreateMapSurroundElement(
    layout, rec_env, tableFrameInfo) as TableFrame;
}

{
  //Note: Must be on QueuedTask.Run

  //Build geometry
  Coordinate2D ll = new Coordinate2D(6, 2.5);
  Coordinate2D ur = new Coordinate2D(8, 4.5);
  Envelope env = EnvelopeBuilderEx.CreateEnvelope(ll, ur);

  //Reference MF, create legend and add to layout
  MapFrame mf = layout.FindElement("Map Frame") as MapFrame;
  var surroundInfo = new LegendInfo()
  {
    MapFrameName = mf.Name
  };

  var legendElm = ElementFactory.Instance.CreateMapSurroundElement(
    layout, env.Center, surroundInfo) as Legend;
  legendElm.SetName("New Legend");
}

{
  //Note: Must be on QueuedTask.Run

  //Build geometry
  Coordinate2D center = new Coordinate2D(7, 5.5);

  //Reference a North Arrow in a style
  StyleProjectItem stylePrjItm = Project.Current.GetItems<StyleProjectItem>()
                                 .FirstOrDefault(item => item.Name == "ArcGIS 2D");
  NorthArrowStyleItem naStyleItm = stylePrjItm.SearchNorthArrows(
                                         "ArcGIS North 10")[0];

  //Reference MF, create north arrow and add to layout 

  var mf = layout.FindElement("Map Frame") as MapFrame;
  var narrow_info = new NorthArrowInfo()
  {
    MapFrameName = mf.Name,
    NorthArrowStyleItem = naStyleItm
  };
  var arrowElm = (NorthArrow)ElementFactory.Instance.CreateMapSurroundElement(
    layout, center.ToMapPoint(), narrow_info) as NorthArrow;
  arrowElm.SetName("New North Arrow");
  arrowElm.SetHeight(1.75);
  arrowElm.SetX(7);
  arrowElm.SetY(6);
}

{
  //Note: Must be on QueuedTask.Run

  //Build geometry
  Coordinate2D ll = new Coordinate2D(1, 1);
  Coordinate2D ur = new Coordinate2D(4, 4);
  Envelope env = EnvelopeBuilderEx.CreateEnvelope(ll, ur);

  var tableFrameInfo = new TableFrameInfo()
  {
    MapFrameName = "Map Frame",
    MapMemberUri = "CIMPATH=USNationalParks/NationalParks.json"
  };
  var attribs = new List<CIMStringMap>();
  for (int i = 1; i < 6; i++)
  {
    attribs.Add(new CIMStringMap
    {
      Key = $"Key {i}",
      Value = $"Value {i}"
    });
  }
  var elemInfo = new ElementInfo()
  {
    CustomProperties = attribs
  };
  var tableFrameElem = ElementFactory.Instance.CreateMapSurroundElement(
                                layout, env.Center, tableFrameInfo,
                                "New Table Frame", false, elemInfo) as TableFrame;
}

{
  //Note: Must be on QueuedTask.Run

  //Build geometry
  Coordinate2D ll = new Coordinate2D(5.0, 6);
  Coordinate2D ur = new Coordinate2D(6.0, 7);
  Envelope sbEnv = EnvelopeBuilderEx.CreateEnvelope(ll, ur);

  //Reference a Scale Bar in a style
  StyleProjectItem stylePrjItm = Project.Current.GetItems<StyleProjectItem>()
                .FirstOrDefault(item => item.Name == "ArcGIS 2D");
  ScaleBarStyleItem sbStyleItm = stylePrjItm.SearchScaleBars(
               "Alternating Scale Bar 1")[0];
  //ScaleBarStyleItem sbStyleItm = stylePrjItm.SearchScaleBars(
  //                                   "Double Alternating Scale Bar 1")[0];
  //ScaleBarStyleItem sbStyleItm = stylePrjItm.SearchScaleBars(
  //                                    "Hollow Scale Bar 1")[0];

  //Create Scale Bar
  ScaleBarInfo sbInfo = new ScaleBarInfo()
  {
    MapFrameName = mapFrame.Name,
  };

  var sbElm = ElementFactory.Instance.CreateMapSurroundElement(
                                     layout, sbEnv, sbInfo) as ScaleBar;
}

{
  //Note: Must be on QueuedTask.Run
  //Build geometry
  Coordinate2D ll = new Coordinate2D(5.0, 8);
  Coordinate2D ur = new Coordinate2D(6.0, 9);
  Envelope sbEnv = EnvelopeBuilderEx.CreateEnvelope(ll, ur);

  //Reference a Scale Bar in a style
  StyleProjectItem stylePrjItm = Project.Current.GetItems<StyleProjectItem>()
                               .FirstOrDefault(item => item.Name == "ArcGIS 2D");
  ScaleBarStyleItem sbStyleItm = stylePrjItm.SearchScaleBars(
                                "Scale Line 1")[0];
  //ScaleBarStyleItem sbStyleItm = stylePrjItm.SearchScaleBars(
  //                                           "Stepped Scale Line")[0];
  //ScaleBarStyleItem sbStyleItm = stylePrjItm.SearchScaleBars(
  //                                            "Scale Line 2")[0];

  //Create Scale Bar
  ScaleBarInfo sbInfo = new ScaleBarInfo()
  {
    MapFrameName = mapFrame.Name,
    ScaleBarStyleItem = sbStyleItm
  };

  var sbElm = ElementFactory.Instance.CreateMapSurroundElement(
                    layout, sbEnv, sbInfo, "ScaleBar Line") as ScaleBar;
}