Well that's because images are embedded inside pdf files.
I think when you create a pdf, you have to use the physical location of the file, and not the virtual location, in order to embed the image. That should of been in the instructions for your pdf generator.
Perhaps it's me, but I can't really make head-nor-tails of your question: it doesn't seem to make any sense. Do you mean that you want to add Google analytics to an asp.net website? If so, it is fairly easy: there is lots of help on the web. Search here for articles or on Google.
"If you think it's expensive to hire a professional to do the job, wait until you hire an amateur." Red Adair. nils illegitimus carborundum