MMDeviceEnumerator in c#

The question was regarding C#.
An example usage of MMDeviceEnumerator can be found in the C# open source project NAudio at http://naudio.codeplex.com/ with the latest source at NAUDIO Source[^].
Once you reference the project with

#using NAudio.CoreAudioAPI

then you can enumerate your audio devices with the following...

var deviceEnum = new MMDeviceEnumerator();
var devices = deviceEnum.EnumerateAudioEndPoints(DataFlow.All, DeviceState.Active).ToList();

The MMDeviceEnumerator is defined as follows:

/// <summary>
/// implements IMMDeviceEnumerator
/// </summary>
[ComImport, Guid("BCDE0395-E52F-467C-8E3D-C4579291692E")]
class MMDeviceEnumeratorComObject
{
}

and if you look up the GUID reference in the registry, it is implemented in the file MMDevAPI.dll

As above but the API in CoreAudioAPI is not all in capitals

using NAudio.CoreAudioApi;