C# Windows Store App can't seem to execute Bat.file

I'm in the middle of creating a POS app, which is meant to run in Kiosk mode on a device with no keyboard (both normal and on-screen).

Therefore it is very important for me, to be able to do 2 things from inside the app.

1. Shutdown Windows

and

2. Restart Windows

To my understanding it's not possible to access process.Start - Hence I created 2 batch files, which is working perfect when double-clicked on my desktop.