public static MapPoint CreateMapPoint( 
   double x,
   double y,
   double z,
   double m,
   SpatialReference spatialReference
)

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

// create a 3d point with M
MapPoint pt = MapPointBuilderEx.CreateMapPoint(1.0, 2.0, 3.0, 4.0);


// builderEx constructors don't need to run on the MCT.
MapPointBuilderEx mb = new MapPointBuilderEx(1.0, 2.0, 3.0, 4.0);
// do something with the builder

MapPoint ptWithM = mb.ToGeometry();


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


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);