Compare pdf's

Question

I have created some code in c# to compare PDF's in Acrobat V9.  I was wondering how to programmatically determine when the comparison is finished.  If you run the comparison by interactively a progress bar is shows, perhaps I can access this.  I would also like to know how to access the the summary page programmatically to determine if there are differences.  We have hundreds of pdf's to compare that need to be compared before and after codes changes. Doing this interactively would be painful.
Some code snippets so it is understood how I am attacking the problem currently.
            PdOldDoc.Open(oldFile);
            PdOldDoc.OpenAVDoc("old");
            PdNewDoc.Open(newFile);
            PdNewDoc.OpenAVDoc("new");
            object activeDoc = AdobeApp.GetActiveDoc();
            AdobeApp.MenuItemIsEnabled("DIGSIG:CompareDocuments");
            bool ret = AdobeApp.MenuItemExecute("DIGSIG:CompareDocuments");
            Sleep(10000);  //For now just wait 10 seconds until a better way can determined to figure out when the compare process finishes
            AdobeApp.CloseAllDocs();

Answer 1

So there are no .Net ways to compare 2 files.  I have 90% of the comparison working and seems strange that I can't silently compare 2 documents and create a 3rd document with the differences.
Through .Net and the Acrobat.dll I can:
1. open the old file
2. open the new file
3  open a compare dialog with the 2 file names populated
4. *Manually select my document comparison type and Manually select OK in the Compare dialog
5. Save the compared file through .Net
6. Close all my Acrobat windows through .Net.
Is there no way to complete step 4 via .Net and the acrobat.dll?
Would another much more $$$ option be to go to a LiveCycle module and pay 40K+ for a module to compare a batch PDFs?
Thanks for any insight you can provide.