How do I use parallel for or foreach?

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VB.NET

This is my first attempt at using Parallel fors. I am still trying to grasp the concept, however, I keep getting errors.

Here is what I have:

Imports System
Imports System.IO
Imports System.Threading
Imports System.Threading.Tasks
Imports Parallel_class
Public Class Class1

    Dim processorcount As New ParallelOptions


    Public Sub Parallel_processing()

'this is where all the process will happen
       

    End Sub

    Public Sub TestMethod1()

        processorcount.MaxDegreeOfParallelism = Environment.ProcessorCount

        'Parallel.ForEach(0, processorcount, AddressOf Parallel_processing)

end sub

I am trying to pass a sub through this routine. I just don't know exactly what to do or which way to go.

What I have tried:

I have tried to switch between for and foreach, and then I tried to switch variables but nothing I tried to seemed to work.