//＞＜
public void DefaultMicrophoneToggleMute()
{
// 'NAudio.CoreAudioApi' Required
using (MMDeviceEnumerator enumerator = new MMDeviceEnumerator())
{
MMDevice mic_device = enumerator.GetDefaultAudioEndpoint(DataFlow.Capture, Role.Communications);
mic_device.AudioEndpointVolume.Mute = !mic_device.AudioEndpointVolume.Mute;
}
}