public override MapPoint ToGeometry()

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

// Builder convenience methods don't need to run on the MCT.
// create a 3d point with M
MapPoint pt = MapPointBuilder.CreateMapPoint(1.0, 2.0, 3.0, 4.0);

MapPoint ptWithM = null;

// Builder constructors need to run on the MCT.
ArcGIS.Desktop.Framework.Threading.Tasks.QueuedTask.Run(() =>
{
  using (MapPointBuilder mb = new MapPointBuilder(1.0, 2.0, 3.0, 4.0))
  {
    // do something with the builder

    ptWithM = mb.ToGeometry();
  }
});

MapPoint clone = ptWithM.Clone() as MapPoint;
MapPoint anotherM = MapPointBuilder.CreateMapPoint(ptWithM);


// builderEx constructors don't need to run on the MCT.
MapPointBuilderEx builderEx = new MapPointBuilderEx(1.0, 2.0, 3.0);
builderEx.HasM = true;
builderEx.M = 4.0;

pt = builderEx.ToGeometry() as MapPoint;


// or another alternative with builderEx constructor
builderEx = new MapPointBuilderEx(1.0, 2.0, true, 3.0, true, 4.0, false, 0);
pt = builderEx.ToGeometry() as MapPoint;


// or use a builderEx convenience method
pt = MapPointBuilderEx.CreateMapPoint(1.0, 2.0, 3.0, 4.0);

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

MapPoint point1 = null;
MapPoint point2 = null;

// Builder constructors need to run on the MCT.
ArcGIS.Desktop.Framework.Threading.Tasks.QueuedTask.Run(() =>
{
  using (MapPointBuilder mb = new MapPointBuilder(1.0, 2.0, 3.0))
  {
    bool bhasZ = mb.HasZ;          // hasZ = true
    bool bhasM = mb.HasM;          // hasM = false
    bool bhasID = mb.HasID;        // hasID = false

    // do something with the builder

    point1 = mb.ToGeometry();

    // change some of the builder properties
    mb.X = 11;
    mb.Y = 22;
    mb.HasZ = false;
    mb.HasM = true;
    mb.M = 44;
    // create another point
    point2 = mb.ToGeometry();
  }
});

double x = point1.X;                  // x = 1.0
double y = point1.Y;                  // y = 2.0
double z = point1.Z;                  // z = 3.0
double m = point1.M;                  // m = Nan
int ID = point1.ID;                   // ID = 0
bool hasZ = point1.HasZ;              // hasZ = true
bool hasM = point1.HasM;              // hasM = false
bool hasID = point1.HasID;            // hasID = false
bool isEmpty = point1.IsEmpty;        // isEmpty = false

bool isEqual = point1.IsEqual(point2);    // isEqual = false

// Builder convenience methods don't need to run on the MCT.
MapPoint point3 = MapPointBuilder.CreateMapPoint(point1);
x = point3.X;                   // x = 1.0
y = point3.Y;                   // y = 2.0
z = point3.Z;                   // z = 3.0
m = point3.M;                   // m = Nan
ID = point3.ID;                 // ID = 0
hasZ = point3.HasZ;             // hasZ = true
hasM = point3.HasM;             // hasM = false
hasID = point3.HasID;           // hasID = false


// builderEx constructors don't need to run on the MCT.
MapPointBuilderEx builderEx = new MapPointBuilderEx(point1);
x = builderEx.X;              // x = 1.0
y = builderEx.Y;              // y = 2.0
z = builderEx.Z;              // z = 3.0
m = builderEx.M;              // m = Nan
ID = builderEx.ID;            // ID = 0
hasZ = builderEx.HasZ;        // hasZ = true
hasM = builderEx.HasM;        // hasM = false
hasID = builderEx.HasID;      // hasID = false
isEmpty = builderEx.IsEmpty;     // isEmpty = false

MapPoint point4 = builderEx.ToGeometry() as MapPoint;


// builderEx convenience methods don't need to run on the MCT.
MapPoint point5 =MapPointBuilderEx.CreateMapPoint(point1);
x = point5.X;              // x = 1.0
y = point5.Y;              // y = 2.0
z = point5.Z;              // z = 3.0
m = point5.M;              // m = Nan
ID = point5.ID;            // ID = 0
hasZ = point5.HasZ;        // hasZ = true
hasM = point5.HasM;        // hasM = false
hasID = point5.HasID;      // hasID = false
isEmpty = point5.IsEmpty;     // isEmpty = false