Bluetooth in Windows CE.NET

[microsoft]

Dear Sir,

I am working on Bluetooth in Windows CE.NET 4.2. I have created a project
using "WCE Application(evc++4.0)" and written some code to implement BT
Manager(BT Client/Server) using virtual Comport. I have given the
"Btdrt.lib" in project setting\Link dialogbox, but I am getting the link
errors, like

"error LNK2019: unresolved external symbol _BthGetHardwareStatus referenced
in function _WinMain"

"error LNK2019: unresolved external symbol _BthReadLocalAddr referenced in
function "int __cdecl BtServerStart(void)" (?BtServerStart@@YAHXZ)"

......

.....

And there are seven Btdrt.lib files in the WINCE420. I have given some path
of the "Btdrt.lib" in "project Setting\link - Additional Library Path", but
I am getting same errors.

So ,if you kindly tell me which Btdrt.lib file I'll use and how I'll avoid
the link errors?

Thanks & Regards

Jagadish