Creating a stirrup in revit

I  am unable to create a stirrup shape. I tried rebar shape create method. The code I used as follows. 

I am working in 2015. Please help.

The code - 

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks; 

using Autodesk.Revit.DB;

using Autodesk.Revit.DB.Analysis;

using Autodesk.Revit.UI;

using Autodesk.Revit.UI.Selection;

using Autodesk.Revit.Creation;

using Autodesk.Revit.DB.Structure;

namespace ColumnSteel

{

    [Autodesk.Revit.Attributes.Transaction(Autodesk.Revit.Attributes.TransactionMode.Automatic)]

    public class Class1 : IExternalCommand

    {

        public Autodesk.Revit.UI.Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements)

        {

            //Variable declaration

            UIApplication app = commandData.Application;

            UIDocument uidoc = commandData.Application.ActiveUIDocument;

            Autodesk.Revit.DB.Document document = uidoc.Document;

            // To catch Exception           

            try

            {

                TaskDialog.Show("Revit", "Select column");

                Reference r = uidoc.Selection.PickObject(ObjectType.Element);

                ElementId e = r.ElementId;

                Autodesk.Revit.DB.Element first = document.GetElement(e);

                FamilyInstance familyInstance = first as FamilyInstance;

                double length;

                Rebar r1;

                Location lp;

                if (null != familyInstance && familyInstance.StructuralType == Autodesk.Revit.DB.Structure.StructuralType.Column)

                {

                    LocationPoint location = first.Location as LocationPoint;

                    XYZ origin = location.Point;

                    bb = first.get_BoundingBox(null);

                    double minX = bb.Min.X;

                    double maxX = bb.Max.X;

                    length = (maxX - minX);

                    double minY = bb.Min.Y;

                    double maxY = bb.Max.Y;

                    double width = (maxY - minY);

                    double height = (bb.Max.Z - bb.Min.Z);

                    double minZ = bb.Min.Z;

                    double p1, p2, p3, p4, p5, p6;

                    XYZ  point1 = new XYZ(minX+.177,minY+.177,minZ);

                    XYZ  point2 = new XYZ(point1.X+length-.177-.177, point1.Y, pont1.Z)                   

                    Line lr1 = Line.CreateBound(point1,point2);

                    // Rebar Type

                      Autodesk.Revit.DB.Structure.RebarBarType rebarType=  RebarBarType.Create(document);

                      rebarType.BarDiameter = 0.025;

                      rebarType.StirrupTieBendDiameter = .1;

                    // Create the line rebar

                    IList<Curve> curves1 = new List<Curve>();

                    curves1.Add(lr1);

                    RebarHookOrientation ho = RebarHookOrientation.Right;

                    RebarHookOrientation hi = RebarHookOrientation.Left; 

          r1 = Rebar.CreateFromCurves(document, Autodesk.Revit.DB.Structure.RebarStyle.StirrupTie   ,rebarType   ,null,null, first, new XYZ(0, -5, 0), curves1, ho, hi, true, true);

                }

                else

                {

                    TaskDialog.Show("Revit", "Selected Item is not column");

                }

                return Result.Succeeded;

            }

            catch (Exception e)

            {

                TaskDialog.Show("Revit", e.Message + " " + e.Data);

                return Result.Failed;

            }

        }

    }

}