I have PPT file on desktop named as \"slide.ppt\". I want to read all slides of this PPT file in my ReadSlide function as below
public void Read
If it was an PPTX, you could read it using OpenXML. Since you specifically asked for PPT, it is a little harder.
You shouldn't use Automation / Interop for sure, since it isn't supported in a server environment.
That means you have to use third-party tools to read the PPT. If you google for them, you will see a long list of them. I have never worked with it, but Aspose seems to do the job very well.