Help Code to close an window/Form on button click using Xamarin Studio

[Ronald Nionzima]

Greetings, Am developing an android app using xamarin, I want to close the a window/form on clicking a button, my code does not achieve it, any help on how to achieve that is highly appreciated.
Bellow is my code
var btn3 = FindViewById (Resource.Id.quitapp);
btn3.Click += delegate {
Application.finish();

};