Generating slide thumbnail from PPTX (C#)

I need somehow to export particular slide as a fixed image(without any shapes or whatever).
When I tried to add an empty slide:

  1. I tried to use the particalar method which required ILayoutSlide object
  2. If the slide I want to add as the image goes the first slide, there is no layout slides so far
  3. Then I tried to copy layout slides from source presentation but god error “Layout slide related to other presentation”

Please provide with an example where I could add “empty” slide (than I could add an image to it)
or how to clean up existing on to be able to add an image.

@epochweb,

Can you please share source file along with expect result so that we may further investigate to help you out.