Access properties of activex object (shockwave flash object) from powerpoint file using c#.net

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C#

ASP.NET

I want to add activex object on ppt using c#. My actual requirement is to access the properties of shockwaveflash object which are present inside the ppt on first slide and change properies(ex: movie, alignment, moviedata etc...) after then overright this ppt with existing one. Let me know if any solution or any external api which are available for this. Actually i want to change the content of ppt file dynamically in c#. If u know any solution reagarding this then please let me know.

Here is code:

PowerPoint.Application pptApp = new PowerPoint.Application();
pptApp.Visible = Office.MsoTriState.msoTrue;
var pptPresent = pptApp.Presentations;
var fileOpen = pptPresent.Open(@file, Office.MsoTriState.msoFalse, Office.MsoTriState.msoTrue, Office.MsoTriState.msoTrue);

// getting first slide
PowerPoint.Slide objSlide = fileOpen.Slides[1];

//Create activex object
ShockwaveFlash objswf = new ShockwaveFlash();
objswf.Movie = "#";

//how to add this object on ppt slide..

// saving the ppt
fileOpen.SaveAs("test.pptx", PowerPoint.PpSaveAsFileType.ppSaveAsDefault, Office.MsoTriState.msoTrue);

// close the ppt
fileOpen.Close();

i am trying to add activex object programmtically. please help me to do this.

Thanks.