Ok, so what I need to do is this
1 load a PDF from file
2 extract the text
3 evaluate the text that's extracted to identify certain words that need to be highlighted in colour [note - it's not just a case of highlighting every time a particular word appears in the PDF, a separate decision needs to be made for each occurence of the word]
4 apply the appropriate colour the the correct words in the PDF in memory.
5 Display the PDF inside our application (using your WPF control).
I've got all the steps working now except for step 4. I have tried alternatives like underlining the words or drawing a box around them, but that nowhere near as good for this particular project.
thanks,
Robin