How to call Win32Shutdown method in a proper way

[Volvere]

Does anyone know how to call Win32Shutdown method of Win32_OperatingSystem class.

Here is what I have got so far:

Dim OSClass As New ManagementClass("Win32_OperatingSystem")
 
        ' Get an input parameters object for this method
        Dim inParams As ManagementBaseObject = processClass.GetMethodParameters("Win32Shutdown")
 
        ' Fill in input parameter values
        inParams("Flags") = 2
        
        ' Execute the method
        Dim outParams As ManagementBaseObject = processClass.InvokeMethod("Win32Shutdown", inParams, Nothing)

I got an error 'invalid method Parameter(s)' when it reached the last line InvokeMethod. What I want to do is just to shutdown the machine using VB.NET.