public Geometry OffsetMs( 
   Geometry geometry,
   double offset
)

{
  // Create a polyline and add an offset of 2 to each of the M-values
  MapPointBuilderEx pointBuilder = new(0, 0)
  {
    M = 1
  };
  MapPoint point1 = pointBuilder.ToGeometry();

  pointBuilder.SetValues(2, 2);
  pointBuilder.M = 3;
  MapPoint point2 = pointBuilder.ToGeometry();

  polyline = PolylineBuilderEx.CreatePolyline([point1, point2], AttributeFlags.HasM); ;

  Polyline outPolyline = GeometryEngine.Instance.OffsetMs(polyline, 2) as Polyline;
  // The xy-values of the points in outPolyline are the same as the points in the input polyline.
  // The M-values in outPolyline are { 3, 5 }

  // Create an envelope and add an offset of 25 to each of the M-values
  EnvelopeBuilderEx envelopeBuilder = new(-5, 1, 2, 4)
  {
    MMin = 10,
    MMax = 20
  };
  Envelope envelope = envelopeBuilder.ToGeometry();

  Envelope outEnvelope = GeometryEngine.Instance.OffsetMs(envelope, 25) as Envelope;
  // The xy-values of the points in outEnvelope are the same as the points in the input envelope.
  // outEnvelope.MMin = 35, outEnvelope.MMax = 45

  // Add a negative offset to the M-values of the envelope
  outEnvelope = GeometryEngine.Instance.OffsetMs(envelope, -10) as Envelope;
  // The xy-values of the points in outEnvelope are the same as the points in the input envelope.
  // outEnvelope.MMin = 0, outEnvelope.MMax = 10
}