Windows Service not pausing print jobs

Hi friends I am facing a very serious problem. I am trying to pause print job when a print request fired and I am trying to get all the printing details(jobid, pagecount, color, etc...) of print jobs which are present in print spooler. If I create the same as stand alone application then it is working perfectly but I want to do it in Windows Service. In Windows service I am not able to get the default printer and not able to pause the printer also. Please give me some input on this context.