public void Move( 
   Layer layer,
   long oid,
   double dx,
   double dy
)

// Moves the shapes (geometries) of all selected features of a given feature layer of the active map view by a fixed offset.
await QueuedTask.Run<bool>(() =>
  {
    double xOffset = 100; // specify your units along the x-axis to move the geometry
    double yOffset = 100; // specify your units along the y-axis to move the geometry
                          // If there are no selected features, return
    if (featureLayer.GetSelection().GetObjectIDs().Count == 0)
      return false;
    // set up a dictionary to store the layer and the object IDs of the selected features
    var selectionDictionary = new Dictionary<MapMember, List<long>>
      {
            { featureLayer, featureLayer.GetSelection().GetObjectIDs().ToList() }
      };
    var moveEditOperation = new EditOperation() { Name = "Move features" };
    moveEditOperation.Move(SelectionSet.FromDictionary(selectionDictionary), xOffset, yOffset);  //specify your units along axis to move the geometry
    if (!moveEditOperation.IsEmpty)
    {
      var result = moveEditOperation.Execute();
      return result; // return the operation result: true if successful, false if not
    }
    return false; // return false to indicate that the operation was not empty
  });