如何将录制的音频序列化为XML并反序列化以在c＃/ xaml metro app中播放？

I am following this media capture sample for my app. Now I don't want to save the audio in MP3 in a folder but I want to serialize that MP3 file in XML and then back want to de-serialize that XML to play the recorded MP3 file. How can I achieve this ? media capture sample for my