public static MapPoint CreateMapPoint( 
   MapPoint point,
   SpatialReference spatialReference
)

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

  // Create a 2D point without a spatial reference
  MapPoint point2D = MapPointBuilderEx.CreateMapPoint(1, 2);
  SpatialReference sr = point2D.SpatialReference; // sr = null
  bool hasZ = point2D.HasZ;   // hasZ = false
  bool hasM = point2D.HasM;   // hasM = false
  bool hasID = point2D.HasID; // hasID = false
  double x = point2D.X;   // x = 1
  double y = point2D.Y;   // y = 2
  double z = point2D.Z;   // z = 0 default value
  double m = point2D.M;   // m is NaN default value
  double id = point2D.ID; // id = 0 default value

  // Or use a builderEx which doesn't need to run on the MCT. 
  MapPointBuilderEx builderEx = new MapPointBuilderEx(1, 2);

  // do something with the builder
  builderEx.Y = 3;
  point2D = builderEx.ToGeometry();
  sr = point2D.SpatialReference; // sr = null
  hasZ = point2D.HasZ;   // hasZ = false
  hasM = point2D.HasM;   // hasM = false
  hasID = point2D.HasID; // hasID = false
  x = point2D.X;   // x = 1
  y = point2D.Y;   // y = 3
  z = point2D.Z;   // z = 0 default value
  m = point2D.M;   // m is NaN default value
  id = point2D.ID; // id = 0 default value

  // Create a 2D point with a spatial reference
  SpatialReference spatialReference = SpatialReferenceBuilder.CreateSpatialReference(4269);
  point2D = MapPointBuilderEx.CreateMapPoint(1, 2, spatialReference);
  sr = point2D.SpatialReference; // sr != null
  int wkid = sr.Wkid; // wkid = 4269

  // Or use a builder
  builderEx = new MapPointBuilderEx(1, 2, spatialReference);

  // Do something with the builder
  builderEx.SetValues(3, 5);
  point2D = builderEx.ToGeometry();
  sr = point2D.SpatialReference; // sr != null
  wkid = sr.Wkid; // wkid = 4269
  x = point2D.X; // x = 3
  y = point2D.Y; // y = 5

  // Change the spatial reference of the builder
  builderEx.SpatialReference = SpatialReferences.WGS84;
  point2D = builderEx.ToGeometry();
  sr = point2D.SpatialReference; // sr != null
  wkid = sr.Wkid; // wkid = 4326
  x = point2D.X; // x = 3
  y = point2D.Y; // y = 5

  // Create a 3D point with M
  MapPoint pointZM = MapPointBuilderEx.CreateMapPoint(1, 2, 3, 4);
  sr = pointZM.SpatialReference; // sr = null
  hasZ = pointZM.HasZ;   // hasZ = true
  hasM = pointZM.HasM;   // hasM = true
  hasID = pointZM.HasID; // hasID = false
  x = pointZM.X;   // x = 1
  y = pointZM.Y;   // y = 2
  z = pointZM.Z;   // z = 3
  m = pointZM.M;   // m = 4
  id = pointZM.ID; // id = 0 default value

  // Create a 3D point with M and a spatial reference
  pointZM = MapPointBuilderEx.CreateMapPoint(1, 2, 3, 4, spatialReference);
  sr = pointZM.SpatialReference; // sr != null
  wkid = sr.Wkid; // wkid = 4269

  // Create a point from another point in three ways
  MapPoint clone = pointZM.Clone() as MapPoint; // Has the same values including the spatial reference as pointZM
  MapPoint anotherZM = MapPointBuilderEx.CreateMapPoint(pointZM);  // Has the same values including the spatial reference as pointZM

  builderEx = new MapPointBuilderEx(pointZM); // Has the same values including the spatial reference as pointZM
  // Do something with the builder
  builderEx.HasM = false;
  builderEx.ID = 7; // Setting the id also sets HasID = true
  MapPoint pointZId = builderEx.ToGeometry();
  sr = pointZId.SpatialReference; // sr != null
  wkid = sr.Wkid; // wkid = 4269
  hasZ = pointZId.HasZ;   // hasZ = true
  hasM = pointZId.HasM;   // hasM = false
  hasID = pointZId.HasID; // hasID = true
  x = pointZId.X;   // x = 1
  y = pointZId.Y;   // y = 2
  z = pointZId.Z;   // z = 3
  m = pointZId.M;   // m is NaN, default value
  id = pointZId.ID; // id = 7

  // Create a point with Z, M, and ID-values
  MapPoint pointZMId = MapPointBuilderEx.CreateMapPoint(1, 2, 3, 4, 5, spatialReference);
  sr = pointZMId.SpatialReference; // sr != null
  wkid = sr.Wkid; // wkid = 4269
  hasZ = pointZMId.HasZ;   // hasZ = true
  hasM = pointZMId.HasM;   // hasM = true
  hasID = pointZMId.HasID; // hasID = true
  x = pointZMId.X;   // x = 1
  y = pointZMId.Y;   // y = 2
  z = pointZMId.Z;   // z = 3
  m = pointZMId.M;   // m = 4
  id = pointZMId.ID; // id = 5

  // Pick and choose which attributes to include
  MapPoint point = MapPointBuilderEx.CreateMapPoint(1, 2, false, 3, true, 4, true, 5);
  sr = point.SpatialReference; // sr = null
  hasZ = point.HasZ;   // hasZ = false
  hasM = point.HasM;   // hasM = true
  hasID = point.HasID; // hasID = true
  x = point.X;   // x = 1
  y = point.Y;   // y = 2
  z = point.Z;   // z = 0, default value
  m = point.M;   // m = 4
  id = point.ID; // id = 5

  // Or use a builder
  builderEx = new(1, 2, true, 3, false, 4, true, 5);
  // Do something with the builder
  builderEx.ID = 7;
  builderEx.SpatialReference = SpatialReferences.WGS84;
  point = builderEx.ToGeometry();
  sr = point.SpatialReference; // sr != null
  wkid = sr.Wkid; // wkid = 4326
  hasZ = point.HasZ;   // hasZ = true
  hasM = point.HasM;   // hasM = false
  hasID = point.HasID; // hasID = true
  x = point.X;   // x = 1
  y = point.Y;   // y = 2
  z = point.Z;   // z = 0, default value
  m = point.M;   // m is NaN, default value
  id = point.ID; // id = 7
}