Pause Custom service

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VB

I create windows custom service in my project.

I control this service whenever I start or stop through coding.
But not working in pause, error shown(i.e.: Cannot pause MNCPService service on computer '.')
My code is below :

Dim myMNCPServiceControler As ServiceController

myMNCPServiceControler = New ServiceController(mncpServiceManager) 
If MNCPServiceManagerStatus = ServiceControllerStatus.Stopped.ToString() Or           MNCPServiceManagerStatus = ServiceControllerStatus.Running.ToString() Then
myMNCPServiceControler.Pause()
myMNCPServiceControler.Refresh()
End If

Please help me