apppool stop/start through website

Hi, I would like to create a website that can stop or start an apppool on the local machine. The local machine is a Windows 2012 server and websites are hosted in IIS 8.0.

My code currently always ends with "System.Management.ManagementException: Invalid namespace"

Can someone tell me how to get the correct namespace and my code working?

The code is:

Private Shared Sub SendAppPoolCommand(appPoolName As String, command As String)
    Dim co As System.Management.ConnectionOptions
    co = New System.Management.ConnectionOptions()
    'Dim objPath As String = "IISApplicationPool.Name='W3SVC/AppPools/" + appPoolName + "'"
    Dim objPath As String = "IISApplicationPool.Name='" + appPoolName + "'"
    Dim scope As System.Management.ManagementScope = New System.Management.ManagementScope("\\localhost\root\MicrosoftIISV2", co)
    Using mc As System.Management.ManagementObject = New System.Management.ManagementObject(objPath)
        mc.Scope = scope
        mc.InvokeMethod(command, Nothing, Nothing)
    End Using
End Sub

Thank you.