title: Get default audio/video device
body: <p>I am using dotNet c# . I need to identify default video and audio device
  I do know that I can enumerate audio device but how to determine default one ?
  ManagementObjectSearcher mo =
                  new ManagementObjectSearcher("select * from Win32_SoundDevice");</p>
  
  <pre><code>        foreach (ManagementObject soundDevice in mo.Get())
          {
              String deviceId = soundDevice.GetPropertyValue("DeviceId").ToString();
              String name = soundDevice.GetPropertyValue("Name").ToString();
              String status = soundDevice.GetPropertyValue("StatusInfo").ToString();
  
          }
  </code></pre>