//
        // Shows pronunciation assessment samples.
        // See more information at https://aka.ms/csspeech/pa
        //
        private static void PronunciationAssessment()
        {
            ConsoleKeyInfo x;

            do
            {
                Console.WriteLine("");
                Console.WriteLine(" Speech SDK - Pronunciation Assessment");
                Console.WriteLine("");
                Console.WriteLine(choose);
                Console.WriteLine("");
                Console.WriteLine(" 1. Pronunciation assessment with microphone input.");
                Console.WriteLine(" 2. Pronunciation assessment with stream input.");
                Console.WriteLine("");
                Console.Write(prompt);

                x = Console.ReadKey();
                Console.WriteLine("\n");
                bool sampleWasRun = true;

                switch (x.Key)
                {
                case ConsoleKey.D1:
                case ConsoleKey.NumPad1:
                    SpeechRecognitionSamples.PronunciationAssessmentWithMicrophoneAsync().Wait();
                    break;

                case ConsoleKey.D2:
                case ConsoleKey.NumPad2:
                    SpeechRecognitionSamples.PronunciationAssessmentWithStream();
                    break;

                case ConsoleKey.D0:
                case ConsoleKey.NumPad0:
                    Console.WriteLine(back);
                    sampleWasRun = false;
                    break;

                default:
                    Console.WriteLine(invalid);
                    sampleWasRun = false;
                    break;
                }

                if (sampleWasRun)
                {
                    Console.WriteLine(done);
                }
            } while (x.Key != ConsoleKey.D0);
        }