Set Input To Default Audio Device ( SetInputToDefaultAudioDevice() )

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C#

audio

Good day,
I need help with this command i cant find how repair it.
It would be a recognition voice to text.

Problem:

...
private SpeechRecognitionEngine _recognizer;

private void button1_Click(object sender, RoutedEventArgs e)
{
...

    _recognizer.SetInputToDefaultAudioDevice();// All works but here is problem.
...
}
...

-------
When i run it.

System.PlatformNotSupportedException

No recognizer is installed.

Thanks for help and sorry for my English. :)