public enum ClothoidCreateMethod : System.Enum, System.IComparable, System.IConvertible, System.IFormattable, System.ISpanFormattable  

{
  MapPoint startPoint = MapPointBuilderEx.CreateMapPoint(0, 0);
  double tangentDirection = Math.PI / 6;
  ArcOrientation orientation = ArcOrientation.ArcCounterClockwise;
  double startRadius = double.PositiveInfinity;
  double endRadius = 0.2;
  ClothoidCreateMethod createMethod = ClothoidCreateMethod.ByAngle;
  double angle = Math.PI / 2;
  CurveDensifyMethod densifyMethod = CurveDensifyMethod.ByLength;
  double densifyParameter = 0.1;

  Polyline polylineCl = PolylineBuilderEx.CreatePolyline(startPoint, tangentDirection, startRadius, endRadius, orientation, createMethod, angle, densifyMethod, densifyParameter, SpatialReferences.WGS84);

  int numPoints = polylineCl.PointCount;
  MapPoint queryPoint = polylineCl.Points[numPoints - 2];

  MapPoint pointOnPath;
  double radiusCalculated, tangentDirectionCalculated, lengthCalculated, angleCalculated;

  PolylineBuilderEx.QueryClothoidParameters(queryPoint, startPoint, tangentDirection, startRadius, endRadius, orientation, createMethod, angle, out pointOnPath, out radiusCalculated, out tangentDirectionCalculated, out lengthCalculated, out angleCalculated, SpatialReferences.WGS84);
}

{
  MapPoint startPoint = MapPointBuilderEx.CreateMapPoint(0, 0);
  MapPoint queryPoint = MapPointBuilderEx.CreateMapPoint(3.8, 1);
  double tangentDirection = 0;
  ArcOrientation orientation = ArcOrientation.ArcCounterClockwise;
  double startRadius = double.PositiveInfinity;
  double endRadius = 1;
  ClothoidCreateMethod createMethod = ClothoidCreateMethod.ByLength;
  double curveLength = 10;
  MapPoint pointOnPath;
  double radiusCalculated, tangentDirectionCalculated, lengthCalculated, angleCalculated;


  PolylineBuilderEx.QueryClothoidParameters(queryPoint, startPoint, tangentDirection, startRadius, endRadius, orientation, createMethod, curveLength, out pointOnPath, out radiusCalculated, out tangentDirectionCalculated, out lengthCalculated, out angleCalculated, SpatialReferences.WGS84);

  pointOnPath = MapPointBuilderEx.CreateMapPoint(3.7652656620171379, 1.0332006103128575);
  radiusCalculated = 2.4876382887687227;
  tangentDirectionCalculated = 0.80797056423543978;
  lengthCalculated = 4.0198770235802987;
  angleCalculated = 0.80797056423544011;

  queryPoint = MapPointBuilderEx.CreateMapPoint(1.85, 2.6);

  PolylineBuilderEx.QueryClothoidParameters(queryPoint, startPoint, tangentDirection, startRadius, endRadius, orientation, createMethod, curveLength, out pointOnPath, out radiusCalculated, out tangentDirectionCalculated, out lengthCalculated, out angleCalculated, SpatialReferences.WGS84);

  pointOnPath = MapPointBuilderEx.CreateMapPoint(1.8409964973501549, 2.6115979967308132);
  radiusCalculated = 1;
  tangentDirectionCalculated = -1.2831853071795867;
  lengthCalculated = 10;
  angleCalculated = 5;

  tangentDirection = Math.PI / 4;
  orientation = ArcOrientation.ArcClockwise;
  startRadius = double.PositiveInfinity;
  endRadius = 0.8;
  createMethod = ClothoidCreateMethod.ByLength;
  curveLength = 10;

  Polyline polylineByLength = PolylineBuilderEx.CreatePolyline(startPoint, tangentDirection, startRadius, endRadius, orientation, createMethod, curveLength, CurveDensifyMethod.ByLength, 0.5, SpatialReferences.WGS84);
}