In actual case, is there any discrepancies when using managementeventwatcher and managementobjectsearcher?

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C#

printing

management

I've been working on a project in which I'm using WMI and WQL class instances in order to use two specific functions.

What I have tried:

I've been working on a project in which I'm using WMI and WQL class instances in order to use two specific functions. Firstly, when there is a print request ManagementEventWatcher listens a request then pauses specific Printer,
Second procedure is that after pausing I have to take number of pages to be printed using ManagementObjectSearcher and collection properties where both Management objects have unique access query is Win32_PrintJob.
The problem after pausing printer I couldn't get number of pages.
Note: I'm using these two specific functions as windows service, invoked them in OnStart method.