private void OpenFile()
 {
     var openFileDialog = new OpenFileDialog();
     openFileDialog.Filter = "All Supported Files (*.wav;*.mp3)|*.wav;*.mp3|All Files (*.*)|*.*";
     bool? result = openFileDialog.ShowDialog();
     if (result.HasValue && result.Value)
     {
         selectedFile = openFileDialog.FileName;
         reader = new AudioFileReader(selectedFile);
         equalizer = new Equalizer(reader, bands);
         player = new WaveOutEvent();
         player.Init(equalizer);
     }
 }