reading powerpoint presentations with c#

String strTemplate, strPic;
			strTemplate =
				"C:\\Documents and Settings\\Nicolas Dufour\\Bureau\\TUJYDKJ.pps";
			strPic = "C:\\Documents and Settings\\Nicolas Dufour\\Mes documents\\Mes images\\200162757-001.jpg";
			bool bAssistantOn;

			PowerPoint.Application objApp;
			PowerPoint.Presentations objPresSet;
			PowerPoint._Presentation objPres;
			PowerPoint.Slides objSlides;
			PowerPoint._Slide objSlide;
			PowerPoint.TextRange objTextRng;
			PowerPoint.Shapes objShapes;
			PowerPoint.Shape objShape;
			PowerPoint.SlideShowWindows objSSWs;
			PowerPoint.SlideShowTransition objSST;
			PowerPoint.SlideShowSettings objSSS;
			PowerPoint.SlideRange objSldRng;
			Graph.Chart objChart;

			//Create a new presentation based on a template.
			objApp = new PowerPoint.Application();
			objApp.Visible = MsoTriState.msoTrue;
			objPresSet = objApp.Presentations;
			objPres = objPresSet.Open(strTemplate,
				MsoTriState.msoFalse, MsoTriState.msoTrue, MsoTriState.msoTrue);
			objSlides = objPres.Slides;
...
...
...
	//Prevent Office Assistant from displaying alert messages:
			bAssistantOn = objApp.Assistant.On;
			objApp.Assistant.On = false;
...
...
...
			//Wait for the slide show to end.
			objSSWs = objApp.SlideShowWindows;
			while(objSSWs.Count>=1)
			{
					System.Threading.Thread.Sleep(100);
			}
			//Reenable Office Assisant, if it was on:
			if(bAssistantOn)
			{
				objApp.Assistant.On = true;
				objApp.Assistant.Visible = false;
			}

			//Close the presentation without saving changes and quit PowerPoint.
			objPres.Close();
			objApp.Quit();