This code will generate a wav file but does not contain any recording

Question

This code will generate a wav file but does not contain any recording

// Define the output wav file of the recorded audio string outputFilePath = @"C:\Users\system_recorded_audio.wav";

        // Redefine the capturer instance with a new instance of the LoopbackCapture class
        WasapiCapture CaptureInstance = new WasapiLoopbackCapture();

        // Redefine the audio writer instance with the given configuration
        WaveFileWriter RecordedAudioWriter = new WaveFileWriter(outputFilePath, CaptureInstance.WaveFormat);

        // When the capturer receives audio, start writing the buffer into the mentioned file
        CaptureInstance.DataAvailable += (s, a) =>
        {
            DelaySeconds(5);
            // Write buffer into the file of the writer instance
            RecordedAudioWriter.Write(a.Buffer, 0, a.BytesRecorded);
        };
            DelaySeconds(5);
        // When the Capturer Stops, dispose instances of the capturer and writer
        CaptureInstance.RecordingStopped += (s, a) =>
        {
            RecordedAudioWriter.Dispose();
            RecordedAudioWriter = null;
            CaptureInstance.Dispose();
        };

        // Start audio recording !
        CaptureInstance.StartRecording();
    }
    public static void DelaySeconds(int iTimeSec)
    {
        TimeSpan delay = TimeSpan.FromSeconds(iTimeSec);
        DateTime start = DateTime.Now;
        TimeSpan elapsed = TimeSpan.Zero;

        // waits in a while loop while checking the abort or cancel flag
        while (elapsed < delay)
        {
            Thread.Sleep(10);
            elapsed = DateTime.Now - start;
        }
    }