Xamarin Android terminate the only fragment that is created

Question

I am doing an app, and I wanted to implement a camera functionality, I did so via a fragment, So on button click the new fragment is created and added. And once a photo is taken it gets saved to the memory, I also have a FileObserver in my original (MainActivity) which checks when the picture was taken/overridden and via that event, which is inside the MainActivity, I want to terminate the camera fragment and return to my MainActivity.

I start the fragment like this:

FragmentManager.BeginTransaction().Replace(Resource.Id.Main, CameraFragment.NewInstance()).Commit();

I was following this demo example: https://docs.microsoft.com/en-us/samples/xamarin/monodroid-samples/android50-camera2basic/

And I dont know what to call in my MainActivity to end the fragment and return to my MainActivity