public new Envelope ToGeometry()

// Use a builderEx convenience method or use a builderEx constructor.

MapPoint minPt = MapPointBuilderEx.CreateMapPoint(1.0, 1.0);
MapPoint maxPt = MapPointBuilderEx.CreateMapPoint(2.0, 2.0);

Envelope envelope = EnvelopeBuilderEx.CreateEnvelope(minPt, maxPt);

EnvelopeBuilderEx builderEx = new EnvelopeBuilderEx(minPt, maxPt);
envelope = builderEx.ToGeometry() as Envelope;

// use the convenience builders
Envelope env1 = EnvelopeBuilderEx.CreateEnvelope(0, 0, 1, 1, SpatialReferences.WGS84);
Envelope env2 = EnvelopeBuilderEx.CreateEnvelope(0.5, 0.5, 1.5, 1.5, SpatialReferences.WGS84);

Envelope env3 = env1.Union(env2);

double area = env3.Area;
double depth = env3.Depth;
double height = env3.Height;
double width = env3.Width;
double len = env3.Length;

MapPoint centerPt = env3.Center;
Coordinate2D coord = env3.CenterCoordinate;

bool isEmpty = env3.IsEmpty;
int pointCount = env3.PointCount;

// coordinates
//env3.XMin, env3.XMax, env3.YMin, env3.YMax
//env3.ZMin, env3.ZMax, env3.MMin, env3.MMax

bool isEqual = env1.IsEqual(env2);    // false

// or use the builderEx constructors which don't need to run on the MCT.
EnvelopeBuilderEx builderEx = new EnvelopeBuilderEx(0, 0, 1, 1, SpatialReferences.WGS84);
builderEx.Union(env2);      // builder is updated to the result

depth = builderEx.Depth;
height = builderEx.Height;
width = builderEx.Width;

centerPt = builderEx.Center;
coord = builderEx.CenterCoordinate;

isEmpty = builderEx.IsEmpty;

env3 = builderEx.ToGeometry() as Envelope;

// use the convenience builders
Envelope env1 = EnvelopeBuilderEx.CreateEnvelope(0, 0, 1, 1, SpatialReferences.WGS84);
Envelope env2 = EnvelopeBuilderEx.CreateEnvelope(0.5, 0.5, 1.5, 1.5, SpatialReferences.WGS84);

bool intersects = env1.Intersects(env2); // true
Envelope env3 = env1.Intersection(env2);


// or use the builderEx constructors which don't need to run on the MCT.
EnvelopeBuilderEx builderEx = new EnvelopeBuilderEx(0, 0, 1, 1, SpatialReferences.WGS84);
intersects = builderEx.Intersects(env2);
builderEx.Intersection(env2);   // note this sets the builder to the intersection
env3 = builderEx.ToGeometry() as Envelope;

// Use a builderEx convenience method or use a builderEx constructor.

// convenience methods don't need to run on the MCT.
Envelope envelope = EnvelopeBuilderEx.CreateEnvelope(100.0, 100.0, 500.0, 500.0);

// shrink the envelope by 50%
Envelope result = envelope.Expand(0.5, 0.5, true);


// builderEx constructors don't need to run on the MCT.
EnvelopeBuilderEx builderEx = new EnvelopeBuilderEx(100.0, 100.0, 500.0, 500.0);
builderEx.Expand(0.5, 0.5, true);
envelope = builderEx.ToGeometry() as Envelope;

Coordinate2D minCoord = new Coordinate2D(1, 3);
Coordinate2D maxCoord = new Coordinate2D(2, 4);

Coordinate2D c1 = new Coordinate2D(0, 5);
Coordinate2D c2 = new Coordinate2D(1, 3);

      
// use the EnvelopeBuilderEx.  This constructor doesn't need to run on the MCT.

EnvelopeBuilderEx builderEx = new EnvelopeBuilderEx(minCoord, maxCoord);
// builderEx.XMin, YMin, Zmin, MMin  = 1, 3, 0, double.Nan
// builderEx.XMax, YMax, ZMax, MMax = 2, 4, 0, double.Nan

// set XMin.  if XMin > XMax; both XMin and XMax change
builderEx.XMin = 6;
// builderEx.XMin, YMin, ZMin, MMin  = 6, 3, 0, double.Nan
// builderEx.XMax, YMax, ZMax, MMax = 6, 4, 0, double.Nan

// set XMax
builderEx.XMax = 8;
// builderEx.XMin, YMin, ZMin, MMin  = 6, 3, 0, double.Nan
// builderEx.XMax, YMax, ZMax, MMax = 8, 4, 0, double.Nan

// set XMax.  if XMax < XMin, both XMin and XMax change
builderEx.XMax = 3;
// builderEx.XMin, YMin, ZMin, MMin  = 3, 3, 0, double.Nan
// builderEx.XMax, YMax, ZMax, MMax = 3, 4, 0, double.Nan

// set YMin
builderEx.YMin = 2;
// builderEx.XMin, YMin, ZMin, MMin  = 3, 2, 0, double.Nan
// builderEx.XMax, YMax, ZMax, MMax = 3, 4, 0, double.Nan

// set ZMin.  if ZMin > ZMax, both ZMin and ZMax change
builderEx.ZMin = 3;
// builderEx.XMin, YMin, ZMin, MMin  = 3, 2, 3, double.Nan
// builderEx.XMax, YMax, ZMax, MMax = 3, 4, 3, double.Nan

// set ZMax.  if ZMax < ZMin. both ZMin and ZMax change
builderEx.ZMax = -1;
// builderEx.XMin, YMin, ZMin, MMin  = 3, 2, -1, double.Nan
// builderEx.XMax, YMax, ZMax, MMax = 3, 4, -1, double.Nan

builderEx.SetZCoords(8, -5);
// builderEx.XMin, YMin, ZMin, MMin  = 3, 2, -5, double.Nan
// builderEx.XMax, YMax, ZMax, MMax = 3, 4, 8, double.Nan


builderEx.SetXYCoords(c1, c2);
// builderEx.XMin, YMin, ZMin, MMin  = 0, 3, -5, double.Nan
// builderEx.XMax, YMax, ZMax, MMax = 1, 5, 8, double.Nan


builderEx.HasM = true;
builderEx.SetMCoords(2, 5);

var geomEx = builderEx.ToGeometry();