Set Rounding of Decimal Units in Display Dimensions (C#)

//----------------------------------------------------------------------------
// Preconditions: Open:
//    public_documents\samples\tutorial\api\box.slddrw
//
// Postconditions:
// 1. Click the display dimension in the graphics area.
// 2. Under Dual Dimension on the Value tab, observe that Inward rounding
//    is selected.
// 3. Under Override Units on the Other tab, observe that:
//    * Decimal is clicked.
//    * Feet & Inches is selected.
//    * Truncate without rounding is selected.
//
// NOTE: Because the model is used elsewhere,
// do not save changes when closing it.
// ---------------------------------------------------------------------------
using Microsoft.VisualBasic;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Diagnostics;
using SolidWorks.Interop.sldworks;
using SolidWorks.Interop.swconst;
using System.Runtime.InteropServices;
namespace SetDual2_CSharp.csproj
{
    partial class SolidWorksMacro
    {

        ModelDoc2 Part;
        SelectionMgr swSelMgr;
        DisplayDimension swDispDim;
        bool boolstatus;

        int longstatus;

        public void Main()
        {
            Part = (ModelDoc2)swApp.ActiveDoc;

            swSelMgr = (SelectionMgr)Part.SelectionManager;
            boolstatus = Part.Extension.SelectByID2("RD1@Drawing View1", "DIMENSION", 0.305961854224123, 0.247549077953509, 0, false, 0, null, 0);
            swDispDim = (DisplayDimension)swSelMgr.GetSelectedObject6(1, 0);

            longstatus = swDispDim.SetUnits2(false, (int)swLengthUnit_e.swFEETINCHES, (int)swFractionDisplay_e.swDECIMAL, 0, false, (int)swUnitsDecimalRounding_e.swUnitsDecimalRounding_Truncate);
            swDispDim.SetDual2(false, true);

        }


        public SldWorks swApp;

    }

}