coredll.dll Error

[C# Programming]

Hi all ,i would like to find default Audio devicesin my desktop application, i used coredll.dll , while accessing the deviceID i m getting the follwoing error. i have tried TAPI , DirectX for Audio streaming no fruitfull result.

code:
if (KernelIoControl(IOCTL_HAL_GET_DEVICEID, IntPtr.Zero, 0, outbuff, nBuffSize, ref dwOutBytes))

Error :

Unable to load DLL 'coredll.dll': The specified module could not be found. (Exception from HRESULT: 0x8007007E)

could anyone suggest me whetehr we can use coredll.dll.