public void SetX( 
   double x
)

//Modify an element's X position.

//Perform on the worker thread
await QueuedTask.Run(() =>
{
  double elmX = element.GetX();
  elmX = 4.25;

  element.SetX(elmX); //You don't have to get to set; a shortcut would be: element.SetX(4.25);

});

//Create a scale bar for a specific map frame and assign a scale bar style item.

//Construct on the worker thread
await QueuedTask.Run(() =>
{
  //Reference a North Arrow in a style
  StyleProjectItem stylePrjItm = Project.Current.GetItems<StyleProjectItem>().FirstOrDefault(item => item.Name == "ArcGIS 2D");
  ScaleBarStyleItem sbStyleItm = stylePrjItm.SearchScaleBars("Double Alternating Scale Bar 1")[0];

  //Build geometry
  Coordinate2D center = new Coordinate2D(7, 8);

  //Reference MF, create north arrow and add to layout 
  MapFrame mf = layout.FindElement("New Map Frame") as MapFrame;
  if (mf == null)
  {
    ArcGIS.Desktop.Framework.Dialogs.MessageBox.Show("Map frame not found", "WARNING");
    return;
  }

  //At 2.x -
  //ScaleBar sbElm = LayoutElementFactory.Instance.CreateScaleBar(layout, center, mf, sbStyleItm);
  //sbElm.SetName("New Scale Bar");
  //sbElm.SetWidth(2);
  //sbElm.SetX(6);
  //sbElm.SetY(7.5); 

  var sbInfo = new ScaleBarInfo()
  {
    MapFrameName = mf.Name,
    ScaleBarStyleItem = sbStyleItm
  };
  var sbElm = ElementFactory.Instance.CreateMapSurroundElement(
                                      layout, center.ToMapPoint(), sbInfo, "New Scale Bar") as ScaleBar;
  sbElm.SetWidth(2);
  sbElm.SetX(6);
  sbElm.SetY(7.5);
});

//Create a north arrow for a specific map frame and assign a north arrow style item.

//Construct on the worker thread
await QueuedTask.Run(() =>
{
  //Reference a North Arrow in a style
  StyleProjectItem stylePrjItm = Project.Current.GetItems<StyleProjectItem>().FirstOrDefault(item => item.Name == "ArcGIS 2D");
  NorthArrowStyleItem naStyleItm = stylePrjItm.SearchNorthArrows("ArcGIS North 10")[0];

  //Build geometry
  Coordinate2D center = new Coordinate2D(7, 5.5);

  //Reference MF, create north arrow and add to layout 
  MapFrame mf = layout.FindElement("New Map Frame") as MapFrame;
  if (mf == null)
  {
    ArcGIS.Desktop.Framework.Dialogs.MessageBox.Show("Map frame not found", "WARNING");
    return;
  }
  //At 2.x -
  //NorthArrow arrowElm = LayoutElementFactory.Instance.CreateNorthArrow(layout, center, mf, naStyleItm);
  //arrowElm.SetName("New North Arrow");
  //arrowElm.SetHeight(1.75);
  //arrowElm.SetX(7);
  //arrowElm.SetY(6);

  var naInfo = new NorthArrowInfo()
  {
    MapFrameName = mf.Name,
    NorthArrowStyleItem = naStyleItm
  };

  var arrowElm = ElementFactory.Instance.CreateMapSurroundElement(
                            layout, center.ToMapPoint(), naInfo, "New North Arrow") as NorthArrow;
  arrowElm.SetHeight(1.75);
  arrowElm.SetX(7);
  arrowElm.SetY(6);
});

//This example finds a layout element by name and clones it a specified number of times and applies an accumlative offset for each 
//cloned element.

//Added references
using ArcGIS.Core.CIM;                             //CIM
using ArcGIS.Desktop.Core;                         //Project
using ArcGIS.Desktop.Layouts;                      //Layout class
using ArcGIS.Desktop.Framework.Threading.Tasks;    //QueuedTask

public class GraphicElementExample2
{
  public static Task<bool> CloneElementAsync(string LayoutName, string ElementName, double offset, int numCopies)
  {
    //Reference a layoutitem in a project by name
    LayoutProjectItem layoutItem = Project.Current.GetItems<LayoutProjectItem>().FirstOrDefault(item => item.Name.Equals(LayoutName));
    if (layoutItem == null)
      return Task.FromResult(false);

    return QueuedTask.Run<bool>(() =>
    {
      //Reference and load the layout associated with the layout item
      Layout lyt = layoutItem.GetLayout();

      //Reference a element by name
      GraphicElement graElm = lyt.FindElement(ElementName) as GraphicElement;
      if (graElm == null)
        return false;

      //Loop through the number of copies, clone, and set the offsets for each new element
      double orig_offset = offset;
      while (numCopies != 0)
      {
        GraphicElement cloneElm = graElm.Clone("Clone");
        cloneElm.SetX(cloneElm.GetX() + offset);
        cloneElm.SetY(cloneElm.GetY() - offset);
        offset = offset + orig_offset;
        numCopies = numCopies - 1;
      }

      return true;
    });
  }
}

//Create a simple point text element and assign basic symbology and text settings.

//Construct on the worker thread
await QueuedTask.Run(() =>
{
  //Build 2D point geometry
  Coordinate2D coord2D = new Coordinate2D(3.5, 10);

  //Set symbology, create and add element to layout
  CIMTextSymbol sym = SymbolFactory.Instance.ConstructTextSymbol(
                ColorFactory.Instance.RedRGB, 32, "Arial", "Regular");
  string textString = "Point text";
  //At 2.x - GraphicElement ptTxtElm =
  //         LayoutElementFactory.Instance.CreatePointTextGraphicElement(
  //                           layout, coord2D, textString, sym);
  //ptTxtElm.SetName("New Point Text");
  //ptTxtElm.SetAnchor(Anchor.CenterPoint);
  //ptTxtElm.SetX(4.5);
  //ptTxtElm.SetY(9.5);
  //ptTxtElm.SetRotation(45);

  //use ElementInfo to set placement properties during create
  var elemInfo = new ElementInfo()
  {
    Anchor = Anchor.CenterPoint,
    Rotation = 45
  };
  var ptTxtElm = ElementFactory.Instance.CreateTextGraphicElement(
    container, TextType.PointText, coord2D.ToMapPoint(), sym, textString,
                       "New Point Text", true, elemInfo);

  //Change additional text properties
  ptTxtElm.SetX(4.5);
  ptTxtElm.SetY(9.5);
});

//Must be on QueuedTask.Run(() => { ...

//Build geometry
Coordinate2D center = new Coordinate2D(7, 5.5);

//Reference a North Arrow in a style
StyleProjectItem stylePrjItm = Project.Current.GetItems<StyleProjectItem>()
                               .FirstOrDefault(item => item.Name == "ArcGIS 2D");
NorthArrowStyleItem naStyleItm = stylePrjItm.SearchNorthArrows(
                                       "ArcGIS North 10")[0];

//Reference MF, create north arrow and add to layout 
//var mf = container.FindElement("New Map Frame") as MapFrame;
var mf = layout.FindElement(MapFrameName) as MapFrame;
var narrow_info = new NorthArrowInfo()
{
  MapFrameName = mf.Name,
  NorthArrowStyleItem = naStyleItm
};
var arrowElm = (NorthArrow)ElementFactory.Instance.CreateMapSurroundElement(
  layout, center.ToMapPoint(), narrow_info) as NorthArrow;
arrowElm.SetName("New North Arrow");
arrowElm.SetHeight(1.75);
arrowElm.SetX(7);
arrowElm.SetY(6);

//Update text element properties for an existing text element.

// Reference a layoutitem in a project by name
LayoutProjectItem layoutItem = Project.Current.GetItems<LayoutProjectItem>()
                      .FirstOrDefault(item => item.Name.Equals("MyLayout"));
if (layoutItem != null)
{

  //Perform on the worker thread
  QueuedTask.Run(() =>
  {
    // Reference and load the layout associated with the layout item
    Layout layout = layoutItem.GetLayout();
    if (layout != null)
    {
      // Reference a text element by name
      TextElement txtElm = layout.FindElement("MyTextElement") as TextElement;
      if (txtElm != null)
      {
        // Change placement properties
        txtElm.SetAnchor(Anchor.CenterPoint);
        txtElm.SetX(x);
        txtElm.SetY(y);

        // Change TextProperties
        TextProperties txtProperties = new TextProperties(
                         "Hello world", "Times New Roman", 48, "Regular");
        txtElm.SetTextProperties(txtProperties);
      }
    }
  });
}

//Clone a layout graphic element and apply an offset.

//Perform on the worker thread
QueuedTask.Run(() =>
{
  // Reference and load the layout associated with the layout item
  Layout layout = layoutItem.GetLayout();
  if (layout != null)
  {
    // Reference a graphic element by name
    GraphicElement graphicElement = 
                        layout.FindElement("MyElement") as GraphicElement;
    if (graphicElement != null)
    {

      //Clone and set the new x,y
      GraphicElement cloneElement = graphicElement.Clone("Clone");
      cloneElement.SetX(cloneElement.GetX() + xOffset);
      cloneElement.SetY(cloneElement.GetY() + yOffset);
    }
  }
});