public bool IsEqual( 
   MapPoint mapPoint
)

{
  // MapPointBuilderEx constructors can run on any thread.

  MapPoint point1 = null;
  MapPoint point2 = null;

  SpatialReference spatialReference = SpatialReferenceBuilder.CreateSpatialReference(54004);

  MapPointBuilderEx mapPointBuilder = new MapPointBuilderEx(100, 200, spatialReference);
  SpatialReference sr = mapPointBuilder.SpatialReference; // sr != null
  int wkid = sr.Wkid; // wkid = 54004
  bool hasZ = mapPointBuilder.HasZ;   // hasZ = false
  bool hasM = mapPointBuilder.HasM;   // hasM = false
  bool hasID = mapPointBuilder.HasID; // hasID = false
  bool isEmpty = mapPointBuilder.IsEmpty; // isEmpty = false
  double x = mapPointBuilder.X;   // x = 100
  double y = mapPointBuilder.Y;   // y = 200
  double z = mapPointBuilder.Z;   // z = 0, default value
  double m = mapPointBuilder.M;   // m is NaN, default value
  double id = mapPointBuilder.ID; // id = 0, default value

  // Do something with the builder
  mapPointBuilder.Z = 12; // Setting the z-value automatically sets HasZ property to true

  point1 = mapPointBuilder.ToGeometry();
  sr = point1.SpatialReference; // sr != null
  wkid = sr.Wkid; // wkid = 54004
  hasZ = point1.HasZ;   // hasZ = true
  hasM = point1.HasM;   // hasM = false
  hasID = point1.HasID; // hasID = false
  x = point1.X;   // x = 100
  y = point1.Y;   // y = 200
  z = point1.Z;   // z = 12
  m = point1.M;   // m is NaN, default value
  id = point1.ID; // id = 0, default value

  // Change some of the builder properties
  mapPointBuilder.SetValues(11, 22);
  mapPointBuilder.HasZ = false;
  mapPointBuilder.HasM = true;
  mapPointBuilder.M = 44;

  // Create another point
  point2 = mapPointBuilder.ToGeometry();

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

  // Set the builder to empty
  // Sets X and Y to NaN. Sets other attributes to the default values.
  // Does not change the attribute awareness.
  mapPointBuilder.SetEmpty();

  MapPoint point3 = mapPointBuilder.ToGeometry();
  sr = point3.SpatialReference; // sr != null
  wkid = sr.Wkid; // wkid = 54004
  hasZ = point3.HasZ;        // hasZ = false
  hasM = point3.HasM;        // hasM = true
  hasID = point3.HasID;      // hasID = false
  isEmpty = point3.IsEmpty;  // isEmpty = true
  x = point3.X;              // x is NaN
  y = point3.Y;              // y is NaN
  z = point3.Z;              // z = 0, default value
  m = point3.M;              // m is NaN, default value
  id = point3.ID;            // ID = 0, default value

  // Create a builder from a point
  mapPointBuilder = new MapPointBuilderEx(point2); // point1 = (11, 22, 0, 44, 0)
  sr = mapPointBuilder.SpatialReference; // sr != null
  wkid = sr.Wkid; // wkid = 54004
  hasZ = mapPointBuilder.HasZ;        // hasZ = false
  hasM = mapPointBuilder.HasM;        // hasM = true
  hasID = mapPointBuilder.HasID;      // hasID = false
  isEmpty = mapPointBuilder.IsEmpty;  // isEmpty = false
  x = mapPointBuilder.X;              // x = 11
  y = mapPointBuilder.Y;              // y = 22
  z = mapPointBuilder.Z;              // z = 0, default value
  m = mapPointBuilder.M;              // m = 44
  id = mapPointBuilder.ID;            // ID = 0, default value

  // Setting attribute values automatically sets the corresponding flag to true
  mapPointBuilder.Z = 150;
  mapPointBuilder.ID = 2;

  // Remove the spatial reference
  mapPointBuilder.SpatialReference = null;

  MapPoint point4 = mapPointBuilder.ToGeometry() as MapPoint;
  sr = point3.SpatialReference; // sr = null
  hasZ = point3.HasZ;        // hasZ = true
  hasM = point3.HasM;        // hasM = true
  hasID = point3.HasID;      // hasID = true
  isEmpty = point3.IsEmpty;  // isEmpty = false
  x = point3.X;              // x = 11
  y = point3.Y;              // y = 22
  z = point3.Z;              // z = 150
  m = point3.M;              // m = 44
  id = point3.ID;            // ID = 2
}

{
  MapPoint pt1 = MapPointBuilderEx.CreateMapPoint(1, 2, 3, 4, 5);
  int ID = pt1.ID;           // ID = 5
  bool hasID = pt1.HasID;     // hasID = true

  MapPoint pt2 = MapPointBuilderEx.CreateMapPoint(1, 2, 3, 4, 0);
  ID = pt2.ID;        // ID = 0
  hasID = pt2.HasID;  // hasID = true

  MapPoint pt3 = MapPointBuilderEx.CreateMapPoint(1, 2, 3, 4);
  ID = pt3.ID;          // ID = 0
  hasID = pt3.HasID;    // hasID = false

  MapPoint pt4 = MapPointBuilderEx.CreateMapPoint(1, 2, 3, 44);
  ID = pt4.ID;          // ID = 0
  hasID = pt4.HasID;    // hasID = false
  bool hasM = pt4.HasM; // hasM = true

  MapPoint pt5 = MapPointBuilderEx.CreateMapPoint(1, 2, 3);
  ID = pt5.ID;          // ID = 0
  hasID = pt5.HasID;    // hasID = false
  hasM = pt5.HasM;      // hasM = false

  bool isEqual = pt1.IsEqual(pt2);   // isEqual = false, different IDs
  isEqual = pt2.IsEqual(pt3);        // isEqual = false, HasId is different
  isEqual = pt4.IsEqual(pt3);        // isEqual = false, different Ms
  isEqual = pt1.IsEqual(pt5);        // isEqual = false, pt has M, id but pt5 does not.  
}