//Custom Jerker Dahlblom..
private static string GetDeviceInstanceId(IntPtr deviceInfoSet)
{
//var descriptionBuffer = new byte[1024];
const int bufferSize = 1024;
//var requiredSize = 0;
//var type = 0;
var ptrInstanceBuf = Marshal.AllocHGlobal(bufferSize);
NativeMethods.CM_Get_Device_ID(deviceInfoSet, ptrInstanceBuf, bufferSize, 0);
var instanceId = Marshal.PtrToStringAuto(ptrInstanceBuf);
return(instanceId);
}