public static InterstitialAd LoadAdInBackground(Context context)
{
InterstitialAd interstitialAd = new InterstitialAd(context);
interstitialAd.AdUnitId = context.GetString(Resource.String.int_ad); //TESTING UNIT. Should be changed for production.
interstitialAd.SetImmersiveMode(true);
interstitialAd.AdListener = new CustomAdListener(interstitialAd, context as AppCompatActivity);
interstitialAd.LoadAd(new AdRequest.Builder().Build());
return(interstitialAd);
}