public static Polyline CreatePolyline( 
   IEnumerable<MapPoint> points,
   SpatialReference spatialReference
)

// list of points
List<MapPoint> points = new List<MapPoint>
{
  MapPointBuilderEx.CreateMapPoint(0, 0, 2, 3, 1),
  MapPointBuilderEx.CreateMapPoint(1, 1, 5, 6),
  MapPointBuilderEx.CreateMapPoint(2, 1, 6),
  MapPointBuilderEx.CreateMapPoint(0, 0)
};

// will have attributes because it is created with convenience method
Polyline polylineWithAttrs = PolylineBuilderEx.CreatePolyline(points);
bool hasZ = polylineWithAttrs.HasZ;          // hasZ = true
bool hasM = polylineWithAttrs.HasM;          // hasM = true
bool hasID = polylineWithAttrs.HasID;        // hasID = true

// will not have attributes because it is specified as a parameter
Polyline polylineWithoutAttrs = 
  PolylineBuilderEx.CreatePolyline(points, AttributeFlags.None);
hasZ = polylineWithoutAttrs.HasZ;          // hasZ = false
hasM = polylineWithoutAttrs.HasM;          // hasM = false
hasID = polylineWithoutAttrs.HasID;        // hasID = false

// will have attributes because it is created with convenience method
Polygon polygonWithAttrs = PolygonBuilderEx.CreatePolygon(points);
hasZ = polygonWithAttrs.HasZ;               // hasZ = true
hasM = polygonWithAttrs.HasM;               // hasM = true
hasID = polygonWithAttrs.HasID;             // hasID = true

// will not have attributes because it is specified as a parameter
Polygon polygonWithoutAttrs = 
      PolygonBuilderEx.CreatePolygon(points, AttributeFlags.None);
hasZ = polygonWithoutAttrs.HasZ;               // hasZ = false
hasM = polygonWithoutAttrs.HasM;               // hasM = false
hasID = polygonWithoutAttrs.HasID;             // hasID = false

// will not have attributes because it is specified as a parameter
PolylineBuilderEx polylineB = 
           new PolylineBuilderEx(points, AttributeFlags.None);
hasZ = polylineB.HasZ;                      // hasZ = false
hasM = polylineB.HasM;                      // hasM = false
hasID = polylineB.HasID;                    // hasID = false

// will have attributes because it is passed an attributed polyline
polylineB = new PolylineBuilderEx(polylineWithAttrs);
hasZ = polylineB.HasZ;                      // hasZ = true
hasM = polylineB.HasM;                      // hasM = true
hasID = polylineB.HasID;                    // hasID = true

// will not have attributes because it is passed a non-attributed polyline
polylineB = new PolylineBuilderEx(polylineWithoutAttrs);
hasZ = polylineB.HasZ;                      // hasZ = false
hasM = polylineB.HasM;                      // hasM = false
hasID = polylineB.HasID;                    // hasID = false

// will not have attributes because it is specified as a parameter
PolygonBuilderEx polygonB = new PolygonBuilderEx(points, AttributeFlags.None);
hasZ = polygonB.HasZ;                       // hasZ = false
hasM = polygonB.HasM;                       // hasM = false
hasID = polygonB.HasID;                     // hasID = false

// will have attributes because it is passed an attributed polygon
polygonB = new PolygonBuilderEx(polygonWithAttrs);
hasZ = polygonB.HasZ;                       // hasZ = true
hasM = polygonB.HasM;                       // hasM = true
hasID = polygonB.HasID;                     // hasID = true

// will not have attributes because it is passed a non-attributed polygon
polygonB = new PolygonBuilderEx(polygonWithoutAttrs);
hasZ = polygonB.HasZ;                       // hasZ = true
hasM = polygonB.HasM;                       // hasM = true
hasID = polygonB.HasID;                     // hasID = true

// Use a builderEx convenience method or a builderEx constructor.
// neither need to run on the MCT

MapPoint startPt = MapPointBuilderEx.CreateMapPoint(1.0, 1.0);
MapPoint endPt = MapPointBuilderEx.CreateMapPoint(2.0, 1.0);

List<MapPoint> list = new List<MapPoint>() { startPt, endPt };

Polyline polyline = PolylineBuilderEx.CreatePolyline(list, SpatialReferences.WGS84);

// use AttributeFlags.None since we only have 2D points in the list
PolylineBuilderEx pb = new PolylineBuilderEx(list, AttributeFlags.None);
pb.SpatialReference = SpatialReferences.WGS84;
Polyline polyline2 = pb.ToGeometry();

// Use AttributeFlags.NoAttributes because we only have 2d points in the list
Polyline polyline4 = PolylineBuilderEx.CreatePolyline(list, AttributeFlags.None);

//Create a graphic freehand element with a simple line style.

//Construct on the worker thread
await QueuedTask.Run(() =>
{
  //Build geometry
  List<Coordinate2D> plCoords = new List<Coordinate2D>();
  plCoords.Add(new Coordinate2D(1.5, 10.5));
  plCoords.Add(new Coordinate2D(1.25, 9.5));
  plCoords.Add(new Coordinate2D(1, 10.5));
  plCoords.Add(new Coordinate2D(0.75, 9.5));
  plCoords.Add(new Coordinate2D(0.5, 10.5));
  plCoords.Add(new Coordinate2D(0.5, 1));
  plCoords.Add(new Coordinate2D(0.75, 2));
  plCoords.Add(new Coordinate2D(1, 1));
  //At 2.x - Polyline linePl = PolylineBuilder.CreatePolyline(plCoords);
  Polyline linePl = PolylineBuilderEx.CreatePolyline(plCoords);

  //Set symbolology, create and add element to layout
  CIMLineSymbol lineSym = SymbolFactory.Instance.ConstructLineSymbol(ColorFactory.Instance.BlackRGB, 2.0, SimpleLineStyle.Solid);
  //At 2.x - GraphicElement lineElm = LayoutElementFactory.Instance.CreateLineGraphicElement(layout, linePl, lineSym);
  //         lineElm.SetName("New Freehand"); 
  GraphicElement lineElm = ElementFactory.Instance.CreateGraphicElement(layout, linePl, lineSym, "New Freehand");
});

//Create an ellipse graphic with simple line and fill styles.

//Construct on the worker thread
await QueuedTask.Run(() =>
{
  //Build geometry
  Coordinate2D center = new Coordinate2D(2, 2.75);
  //At 2.x - EllipticArcBuilder eabElp = new EllipticArcBuilder(center, 0, 1, 0.45, esriArcOrientation.esriArcClockwise);
  var eabElp = new EllipticArcBuilderEx(center, 0, 1, 0.45, ArcOrientation.ArcClockwise);
  EllipticArcSegment ellipse = eabElp.ToSegment();

  //Set symbolology, create and add element to layout
  CIMStroke outline = SymbolFactory.Instance.ConstructStroke(ColorFactory.Instance.GreenRGB, 2.0, SimpleLineStyle.Dot);
  CIMPolygonSymbol ellipseSym = SymbolFactory.Instance.ConstructPolygonSymbol(ColorFactory.Instance.GreyRGB, SimpleFillStyle.Vertical, outline);
  //At 2.x - GraphicElement elpElm = LayoutElementFactory.Instance.CreateEllipseGraphicElement(layout, ellipse, ellipseSym);
  //         elpElm.SetName("New Ellipse");

  var polyLine = PolylineBuilderEx.CreatePolyline(ellipse);
  GraphicElement elpElm = ElementFactory.Instance.CreateGraphicElement(layout, polyLine, ellipseSym, "New Ellipse");
});

//Create curve text with basic text properties.

//Construct on the worker thread
await QueuedTask.Run(() =>
{
  //Build geometry
  Coordinate2D pt1 = new Coordinate2D(3.6, 7.5);
  Coordinate2D pt2 = new Coordinate2D(4.26, 8);
  Coordinate2D pt3 = new Coordinate2D(4.93, 7.1);
  Coordinate2D pt4 = new Coordinate2D(5.6, 7.5);
  //At 2.x - CubicBezierBuilder bez = new CubicBezierBuilder(pt1, pt2, pt3, pt4);
  var bez = new CubicBezierBuilderEx(pt1, pt2, pt3, pt4);
  CubicBezierSegment bezSeg = bez.ToSegment();
  //At 2.x - Polyline bezPl = PolylineBuilder.CreatePolyline(bezSeg);
  Polyline bezPl = PolylineBuilderEx.CreatePolyline(bezSeg);

  //Set symbolology, create and add element to layout
  CIMTextSymbol sym = SymbolFactory.Instance.ConstructTextSymbol(ColorFactory.Instance.BlackRGB, 24, "Comic Sans MS", "Regular");
  //At 2.x - GraphicElement bezTxtElm = LayoutElementFactory.Instance.CreateCurvedTextGraphicElement(layout, bezPl, "Curved Text", sym);
  //         bezTxtElm.SetName("New Splinned Text");
  GraphicElement bezTxtElm = ElementFactory.Instance.CreateTextGraphicElement(
                                layout, TextType.SplinedText, bezPl, sym, "Curved Text", "New Splinned Text");
});

//Must be on QueuedTask.Run(() => { ...

//Build geometry
List<Coordinate2D> plCoords = new List<Coordinate2D>();
plCoords.Add(new Coordinate2D(1.5, 10.5));
plCoords.Add(new Coordinate2D(1.25, 9.5));
plCoords.Add(new Coordinate2D(1, 10.5));
plCoords.Add(new Coordinate2D(0.75, 9.5));
plCoords.Add(new Coordinate2D(0.5, 10.5));
plCoords.Add(new Coordinate2D(0.5, 1));
plCoords.Add(new Coordinate2D(0.75, 2));
plCoords.Add(new Coordinate2D(1, 1));
Polyline linePl = PolylineBuilderEx.CreatePolyline(plCoords);

//Set symbolology, create and add element to layout
CIMLineSymbol lineSym = SymbolFactory.Instance.ConstructLineSymbol(
          ColorFactory.Instance.BlackRGB, 2.0, SimpleLineStyle.Solid);
//var graphic = GraphicFactory.Instance.CreateShapeGraphic(linePl, lineSym);

var ge = ElementFactory.Instance.CreateGraphicElement(
                        container, linePl, lineSym, "New Freehand");

//Must be on QueuedTask.Run(() => { ...

//Build geometry
List<Coordinate2D> plCoords = new List<Coordinate2D>();
plCoords.Add(new Coordinate2D(1, 8.5));
plCoords.Add(new Coordinate2D(1.66, 9));
plCoords.Add(new Coordinate2D(2.33, 8.1));
plCoords.Add(new Coordinate2D(3, 8.5));
Polyline linePl = PolylineBuilderEx.CreatePolyline(plCoords);

//Reference a line symbol in a style
var ProjectStyles = Project.Current.GetItems<StyleProjectItem>();
StyleProjectItem style = ProjectStyles.First(x => x.Name == "ArcGIS 2D");
var symStyle = style.SearchSymbols(StyleItemType.LineSymbol, "Line with 2 Markers")[0];
CIMLineSymbol lineSym = symStyle.Symbol as CIMLineSymbol;
lineSym.SetSize(20);

//Set symbolology, create and add element to layout
//CIMLineSymbol lineSym = SymbolFactory.Instance.ConstructLineSymbol(ColorFactory.Instance.BlueRGB, 4.0, SimpleLineStyle.Solid);
ElementFactory.Instance.CreateGraphicElement(
  container, linePl, lineSym, "New Line");