fulltrustprocesslauncher does not exist in current context

Question

I am trying to figure out how to execute a powershell script from my uwp desktop application. I think I am sort of going in the right direction but need a bit of help. I am getting "The name FullTrustProcessLauncher does not exist in the current context". I have checked the references and I have the Windows Desktop extensions for the UWP.

Can someone help thanks

Mainpage.xaml

   private async void doSomething(object sender, RoutedEventArgs e)
    {
        await  FullTrustProcessLauncher.LaunchFullTrustProcessForCurrentAppAsync();
    }

package manifest

 <Applications>
<Application Id="App" Executable="$targetnametoken$.exe" EntryPoint="ProjectCuwp.App">
<Extensions
xmlns:desktop="http://schemas.microsoft.com/appx/manifest/desktop/windows10">
<desktop:Extension
  Category="windows.fullTrustProcess"
  Executable="powershell.exe" />

References installed: Windows Desktop Extensions for the UWP

Answer 1

I needed to add:

using Windows.ApplicationModel;