Determining if Excel is in Edit mode with Win32 Interop

using System;
using System.Windows.Forms;
using Microsoft.VisualStudio.Tools.Applications.Runtime;
using Excel = Microsoft.Office.Interop.Excel;
using Office = Microsoft.Office.Core;

namespace ExcelInEditModeAddin
{
    public partial class ThisAddIn
    {
        ExcelUtil.ExcelEditorModeEventPublisher _editorModeEventPublisher = null;
        private void ThisAddIn_Startup(object sender, System.EventArgs e)
        {
            #region VSTO generated code

            this.Application = (Excel.Application)Microsoft.Office.Tools.Excel.ExcelLocale1033Proxy.Wrap(typeof(Excel.Application), this.Application);
            _editorModeEventPublisher = new ExcelUtil.ExcelEditorModeEventPublisher(this.Application);
            _editorModeEventPublisher.EditModeOn += _editorModeEventPublisher_EditModeOn;
            _editorModeEventPublisher.EditModeOff += _editorModeEventPublisher_EditModeOff;

            // CHECK THE STATUS IMMEDIATELLY
            ReportEditorModeStatus(_editorModeEventPublisher.IsExcelInEditMode);
            #endregion

        }

        private void ReportEditorModeStatus(bool _editorMode)
        {
            string report = string.Empty;

            if (_editorMode)
                report = "Excel is in editor mode now!";
            else
                report = "Excel is NOT in editor mode now!";

            Application.StatusBar = report;

        }
        void _editorModeEventPublisher_EditModeOff(object sender, EventArgs e)
        {
            ReportEditorModeStatus(false);
        }

        void _editorModeEventPublisher_EditModeOn(object sender, EventArgs e)
        {
            ReportEditorModeStatus(true);
        }

        private void ThisAddIn_Shutdown(object sender, System.EventArgs e)
        {
            _editorModeEventPublisher.EditModeOn -= _editorModeEventPublisher_EditModeOn;
            _editorModeEventPublisher.EditModeOff -= _editorModeEventPublisher_EditModeOff;

            _editorModeEventPublisher.Dispose();
            _editorModeEventPublisher = null;
        }

        #region VSTO generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InternalStartup()
        {
            this.Startup += new System.EventHandler(ThisAddIn_Startup);
            this.Shutdown += new System.EventHandler(ThisAddIn_Shutdown);
        }
        
        #endregion
    }
}