Create a Callout in a Model View Example (C#)

//----------------------------------------------------------------------------
// Preconditions:  
// 1. Open a part document.
// 2. Select:
//    Project > Add Reference > .NET > SolidWorks.Interop.swpublished
//
// Postconditions:
// 1. A callout with one row is created in the first model view.
// 2. Press F5 three more times to add a callout to three other model views.

// NOTE: Because the model is used elsewhere,
// do not save changes when closing it.
// ---------------------------------------------------------------------------
using SolidWorks.Interop.sldworks;
using SolidWorks.Interop.swconst;
using SolidWorks.Interop.swpublished;
using System;
using System.Runtime.InteropServices;
using System.Diagnostics;
namespace ModelViewCallout_CSharp.csproj
{
    partial class SolidWorksMacro
    {

        ModelDoc2 swModelDoc;
        ModelDocExtension swModelDocExtn;
        ModelViewManager ViewMgr;
        ModelView swModelView;
        Callout Viewcallout;

        CalloutHandler handle = new CalloutHandler();

        public void Main()
        {
            swModelDoc = (ModelDoc2)swApp.ActiveDoc;
            swModelDocExtn = swModelDoc.Extension;

            ViewMgr = swModelDoc.ModelViewManager;
            ViewMgr.ViewportDisplay = (int)swViewportDisplay_e.swViewportFourView;
            swModelDoc.GetModelViewCount();
            swModelView = (ModelView)swModelDoc.GetFirstModelView();
            while (((swModelView != null)))
            {
                Viewcallout = swModelView.CreateCallout(1, handle);
                Viewcallout.set_Label2(0,"TEST");
                Viewcallout.SkipColon = false;
                Viewcallout.set_ValueInactive(0,true);
                Viewcallout.SetTargetPoint(0, 0.0, 0.0, 0.0);
                Viewcallout.Display(true);
                System.Diagnostics.Debugger.Break();
                swModelView = (ModelView)swModelView.GetNext();
            }

        }

        public SldWorks swApp;

    }

    [ComVisibleAttribute(true)]
    public class CalloutHandler : SwCalloutHandler
    {

        public bool OnStringValueChanged(object pManipulator, int RowID, string Text)
        {

            Debug.Print("Text: " + Text);
            Debug.Print("Row: " + RowID);

            return true;

        }

    }
}