thread pooling

i am trying to do thread pooling with:

Code:

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        Dim Estado As New AutoResetEvent(False)
        ThreadPool.QueueUserWorkItem(New WaitCallback(AddressOf Trabalhadora), Estado)
        Estado.WaitOne()

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it gives me great control but i soon discovered that the main thread freezes...do i have to create a thread for the thread who controls or threads? or am i missing something?

no one here uses thread pooling?!?!