Issue with Sound Recording in windowsphone8 - windows-phone-8

Question

My code works properly till page active. But after going back to another page when i again navigate on recording page it doesn't work.
here is sample code with page added.
public partial class MainPage : PhoneApplicationPage
{
private Microphone microphone = Microphone.Default;
private byte[] buffer;
private MemoryStream stream = new MemoryStream();
private SoundEffectInstance soundInstance;
private bool soundIsPlaying = false;
// Status images
private BitmapImage blankImage;
private BitmapImage microphoneImage;
private BitmapImage speakerImage;
public MainPage()
{
InitializeComponent();
// Timer to simulate the XNA Framework game loop (Microphone is
// from the XNA Framework). We also use this timer to monitor the
// state of audio playback so we can update the UI appropriately.
DispatcherTimer dt = new DispatcherTimer();
dt.Interval = TimeSpan.FromMilliseconds(33);
dt.Tick += new EventHandler(dt_Tick);
dt.Start();
microphone.BufferReady += new EventHandler<EventArgs>(microphone_BufferReady);
blankImage = new BitmapImage(new Uri("Images/blank.png", UriKind.RelativeOrAbsolute));
microphoneImage = new BitmapImage(new Uri("Images/microphone.png", UriKind.RelativeOrAbsolute));
speakerImage = new BitmapImage(new Uri("Images/speaker.png", UriKind.RelativeOrAbsolute));
}
void dt_Tick(object sender, EventArgs e)
{
try { FrameworkDispatcher.Update(); }
catch { }
if (true == soundIsPlaying)
{
if (soundInstance.State != SoundState.Playing)
{
// Audio has finished playing
soundIsPlaying = false;
// Update the UI to reflect that the
// sound has stopped playing
SetButtonStates(true, true, false);
UserHelp.Text = "press play\nor record";
StatusImage.Source = blankImage;
}
}
}
private void recordButton_Click(object sender, EventArgs e)
{
microphone.BufferDuration = TimeSpan.FromMilliseconds(500);
buffer = new byte[microphone.GetSampleSizeInBytes(microphone.BufferDuration)];
stream.SetLength(0);
microphone.Start();
SetButtonStates(false, false, true);
UserHelp.Text = "record";
StatusImage.Source = microphoneImage;
}
private void stopButton_Click(object sender, EventArgs e)
{
if (microphone.State == MicrophoneState.Started)
{
// In RECORD mode, user clicked the
// stop button to end recording
microphone.Stop();
}
else if (soundInstance.State == SoundState.Playing)
{
// In PLAY mode, user clicked the
// stop button to end playing back
soundInstance.Stop();
}
SetButtonStates(true, true, false);
UserHelp.Text = "ready";
StatusImage.Source = blankImage;
}
private void playButton_Click(object sender, EventArgs e)
{
if (stream.Length > 0)
{
// Update the UI to reflect that
// sound is playing
SetButtonStates(false, false, true);
UserHelp.Text = "play";
StatusImage.Source = speakerImage;
// Play the audio in a new thread so the UI can update.
Thread soundThread = new Thread(new ThreadStart(playSound));
soundThread.Start();
}
}
private void playSound()
{
// Play audio using SoundEffectInstance so we can monitor it's State
// and update the UI in the dt_Tick handler when it is done playing.
SoundEffect sound = new SoundEffect(stream.ToArray(), microphone.SampleRate, AudioChannels.Mono);
soundInstance = sound.CreateInstance();
soundIsPlaying = true;
soundInstance.Play();
}
private void SetButtonStates(bool recordEnabled, bool playEnabled, bool stopEnabled)
{
(ApplicationBar.Buttons[0] as ApplicationBarIconButton).IsEnabled = recordEnabled;
(ApplicationBar.Buttons[1] as ApplicationBarIconButton).IsEnabled = playEnabled;
(ApplicationBar.Buttons[2] as ApplicationBarIconButton).IsEnabled = stopEnabled;
}
}
Another page
public partial class Page1 : PhoneApplicationPage
{
public Page1()
{
InitializeComponent();
}
private void Button_Click(object sender, RoutedEventArgs e)
{
NavigationService.Navigate(new Uri("/MainPage.xaml", UriKind.RelativeOrAbsolute));
}
}
Please if possible give some solution to it because my application is dependent on audio
recording..
Thank You very much....

Answer 1

microphone.BufferReady -= new EventHandler<EventArgs>(microphone_BufferReady);
write this code into OnNavigateFrom even.