private async void EnrollInAsync() { User loggedInUser = MainViewModel.LoggedInUser; var service = new EnrollmentService(); var result = await service.EnrollInAsync(loggedInUser, Course); var contentDialog = new ContentDialog(); if (result) { contentDialog.Content = "A jelentkezés sikeres volt"; } else { contentDialog.Content = "A jelentkezés sikertelen volt"; } contentDialog.CloseButtonText = "Ok"; await contentDialog.ShowAsync(); }