public RowToken Create( 
   MapMember mapMember,
   Inspector inspector
)

{
  var duplicateFeatures = new EditOperation();
  duplicateFeatures.Name = "Duplicate Features";

  //Duplicate with an X and Y offset of 500 map units
  //At 2.x duplicateFeatures.Duplicate(featureLayer, oid, 500.0, 500.0, 0.0);

  //Execute to execute the operation
  //Must be called within QueuedTask.Run
  var insp2 = new Inspector();
  insp2.Load(featureLayer, oid);
  var geom = insp2["SHAPE"] as Geometry;

  var rtoken = duplicateFeatures.Create(insp2.MapMember, insp2.ToDictionary(a => a.FieldName, a => a.CurrentValue));
  if (!duplicateFeatures.IsEmpty)
  {
    if (duplicateFeatures.Execute())//Execute and ExecuteAsync will return true if the operation was successful and false if not
    {
      var modifyOp = duplicateFeatures.CreateChainedOperation();
      modifyOp.Modify(featureLayer, (long)rtoken.ObjectID, GeometryEngine.Instance.Move(geom, 500.0, 500.0));
      if (!modifyOp.IsEmpty)
      {
        var result = modifyOp.Execute();
      }
    }
  }
}

await QueuedTask.Run(() =>
{
  // annoLayer is ~your~ Annotation layer...
  // pnt is ~your~ Annotation geometry ...
  var op = new EditOperation();
  // Use the inspector
  var insp = new Inspector();
  insp.LoadSchema(annoLayer);
  // get the annotation properties from the inspector
  AnnotationProperties annoProperties = insp.GetAnnotationProperties();
  // change the annotation text 
  annoProperties.TextString = DateTime.Now.ToLongTimeString();
  // change font color to green
  annoProperties.Color = ColorFactory.Instance.GreenRGB;
  // change the horizontal alignment
  annoProperties.HorizontalAlignment = HorizontalAlignment.Center;
  annoProperties.Shape = pnt;
  // set the annotation properties back on the inspector
  insp.SetAnnotationProperties(annoProperties);
  // create the annotation
  op.Create(annoLayer, insp); 
  if (!op.IsEmpty)
  {
    var result = op.Execute(); //Execute and ExecuteAsync will return true if the operation was successful and false if not
  }
});