How do i completely close a android app with c# im creating a exit button to kill the app period!

how can this be done

i have used all three methods all they do is minimize the application ... the app is still open in the tabs of open applications .. i need the app gone as if it was never even started in the first place.. any suggestions?

Android.OS.Process.KillProcess(Android.OS.Process.MyPid());

this.FinishAffinity();

System.Environment.Exit(0);