Capturing the "SlideShowNextSlide" Event in a PowerPoint Presentation via C#

Hi, I'm using Visual Studio 2010 C#. -- I have the code shown below, which opens a PowerPoint file and places the slides in "presentation" mode. -- That part works.

My Form is nothing but a basic Windows Form with a button on it called the default "button1" name.
You will also need to add the Microsoft.Office.Interop.PowerPoint reference in your Solution Explorer.

The problem I'm having is capturing a change of slide event, which is called ("SlideShowNextSlide"). To test this, I am simply writing a simple message to the console with Console.WriteLine. -- This is the part that does not work.

Basically, what I would like to do is to capture one of the events below:

- a mouse click on the presentation slide, which advances the position to the next slide.
- a key-down event, which advances the position to the next slide.
- a wireless clicker that issues a "next slide" signal, which advances the position to the next slide.
- any "next slide" event.

I think my problem is that I'm not coding the SlideShowNextSlide EventHandler properly, which is based on the documentation I've reviewed regarding this matter.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using System.Diagnostics;
using Microsoft.Office.Interop;
using Microsoft.Office.Core;
using PowerPoint = Microsoft.Office.Interop.PowerPoint;

namespace ppAPPContoller
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        string fileToOpen = "";
        Stopwatch stopwatch = new Stopwatch();
        OpenFileDialog ofd = new OpenFileDialog();

        Microsoft.Office.Interop.PowerPoint.Application ppApp = new Microsoft.Office.Interop.PowerPoint.Application();
        Microsoft.Office.Interop.PowerPoint.SlideShowWindows objSSWs;
        Microsoft.Office.Interop.PowerPoint.SlideShowSettings objSSS;
        Microsoft.Office.Interop.PowerPoint.SlideShowView oSlideShowView;

        private void button1_Click(object sender, EventArgs e)
        {
            ofd.Filter = "Powerpoint|*.ppt;*.pptx";
            if (ofd.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                fileToOpen = ofd.FileName;
                var pres = ppApp.Presentations;
                var file = pres.Open(fileToOpen, MsoTriState.msoFalse, MsoTriState.msoFalse, MsoTriState.msoTrue);
                var objSlides = file.Slides;

                //Run the Slide Show
                objSSS = file.SlideShowSettings;
                objSSS.Run();
                objSSWs = ppApp.SlideShowWindows;

                button1.Enabled = false;
                Console.WriteLine("Opening in Presentation mode: " + ofd.SafeFileName);
                Console.WriteLine("Full Path: " + ofd.FileName);
            }
            stopwatch.Start();
        }

        // Code to capture SlideShowNextSlide Event
        private void InitPPT()
        {
            this.ppApp.SlideShowNextSlide += this.SlideShowNextSlide;
        }

        private void SlideShowNextSlide(PowerPoint.SlideShowWindow Wn)
        {
            Console.WriteLine("Slide changed....");
        }


        private void Form1_FormClosing_1(object sender, FormClosingEventArgs e)
        {
            ppApp.Quit();
            stopwatch.Stop();
        }

    }
}

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Thanks,
Fulano