From here:

Quote:
[H]ere’s the problem. You begin by using ExecQuery to return performance counter data for all the processes and their properties. So far so good, with one minor caveat: for some reason, more often than not the first time you query a performance monitoring class you’ll get back either 0 or Null for all the property values. Why? To be honest, we don’t know; that’s just the way it works.


So maybe try refreshing it twice before printing it out.
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Bitt Faulk