code for program to view ppt slides on browser in asp .net C#

To view ppt files, in fact to view any other file format that is not directly supported by browserd (e.g. not html, pdf, png, etc.) you need to convert that file into a browser supported format and then you can show that converted representation. In other words, you need to take your powerpoint slides with c# and vb.net and create html content from them which you can then append to your page, or you can convert your powerpoints to pdf with c# and vb.net and then provide that pdf on your page.