New Post: WaveViewer loses image of waveform

private DirectSoundOut output = null;
private WaveIn input = null;
private WaveFileWriter waveWriter = null;
private WaveFileReader waveReader = null;


public void LoadFile(string fileName)
{
      CloseAll(); //just disposes all streams and NAudio objects, like output
      waveReader = new WaveFileReader(fileName);
 
      output = new DirectSoundOut();
      output.Init(new WaveChannel32(waveReader));
}


//plays loaded file
public void Play()
{
      if (_state == State.MONITORING) StopRecord();
      if (output == null) return;
      if (output.PlaybackState != PlaybackState.Playing)
      {
          output.Play();
          _state = State.PLAYING;
      }
}


//stops playing file
public void Stop()
{
      if (output == null) return;
      if (output.PlaybackState != PlaybackState.Stopped)
      {
          output.Stop();
          _state = State.STOPPED;
      }
}


public WaveFileReader GetWaveReader()
{
      return waveReader;
}

JuhasWaveViewer wv = GetWaveViewer(clickedIndex); //JuhasWaveViewer is standard NAudio.WaveViewer with some new features like colors and cutting

string filename = GetCheckedFileName(); //this filename resides in TAG property of WaveViewer
wv.CutSelection(filename); //cuts some part of file and saves the new file with the same name

am.LoadFile(filename); //loads this new file to my AudioManager

//now I want to draw new waveform. _ws is my private WaveStream
wv.WaveStream = null;
_ws = new RawSourceWaveStream(am.GetWaveReader(), am.GetWaveReader().WaveFormat);
wv.WaveStream = _ws;