private async void DoReset() { await DisplayAlert("Resetting is in progress", "It may take a few minutes", "Ok"); FirebaseHelper firebaseHelper = new FirebaseHelper(); for (int i = 1; i < 101; i++) { string login = "******" + i.ToString(); var result = await firebaseHelper.FindUserByLogin(login); if (result != null) { await firebaseHelper.DeleteTestUserForReset(login); } } for (int i = 1; i < 101; i++) { string login = "******" + i.ToString(); string password = "******"; string email = "TestUser"; Random random = new Random(); int score = random.Next(101); int totalScore = random.Next(score, 501); await firebaseHelper.AddTestUserForReset(login, password, email, score, totalScore); } await DisplayAlert("Succes!", "Test users have been reset", "OK"); }