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

int numPoints = polyline.PointCount;
MapPoint queryPoint = polyline.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 polyline = PolylineBuilderEx.CreatePolyline(startPoint, tangentDirection, startRadius, endRadius, orientation, createMethod, curveLength, CurveDensifyMethod.ByLength, 0.5, SpatialReferences.WGS84);