Get SOLIDWORKS Version of Display Dimension (C#)

//------------------------------------------------
// Preconditions:
// 1. Open a drawing document in which a display
//    dimension exists.
// 2. Open the Immediate window.
// 3. Select the display dimension.
//
// Postconditions: Examine the Immediate window
// to see if the selected display dimension
// was created in SOLIDWORKS 2011 or later.
//-------------------------------------------------
using System;
using SolidWorks.Interop.sldworks;
using SolidWorks.Interop.swconst;
using System.Diagnostics;

namespace GetSupportGenericTextDisplayDimensionCSharp.csproj
{
    partial class SolidWorksMacro
    {
        public void Main()
        {
            ModelDoc2 swModel = default(ModelDoc2);
            SelectionMgr swSelMgr = default(SelectionMgr);
            DisplayDimension swDispDim = default(DisplayDimension);
            object swSelObj = null;
            int selCount = 0;
            int selType = 0;

            swModel = (ModelDoc2)swApp.ActiveDoc;
            swSelMgr = (SelectionMgr)swModel.SelectionManager;

            selCount = swSelMgr.GetSelectedObjectCount2(-1);
            if (selCount < 1)
            {
                Debug.Print("Select a display dimension and rerun the macro.");
                return;
            }

            selType = swSelMgr.GetSelectedObjectType3(1, 0);
            swSelObj = (object)swSelMgr.GetSelectedObject6(1, 0);
            switch (selType)
            {
                case (int)swSelectType_e.swSelDIMENSIONS:
                    swDispDim = (DisplayDimension)swSelObj;
                    Debug.Print("Was display dimension created in SOLIDWORKS 2011 or later? " + swDispDim.GetSupportsGenericText());
                    break;
            }

        }


        /// <summary>
        /// The SldWorks swApp variable is pre-assigned for you.
        /// </summary>

        public SldWorks swApp;

    }
}