i want set the my devices's name when use OOP....

@_@

There's no native API for that on Win32 so we can't expose that function either... :-(

i can change name in WINCE Registry HKEY_LOCAL_MACHINE/IDENT/NAME but i must unplug and replug BT Dongle to active the new name.

But changing BluetoothRadio.Name does work on CE, well at least on Windows Mobile.  It works on my device (the version of SdpBrowserPPC/CF2 in the repository has a 'set radio name' menu option and I test it with that).  Try setting the property and see if it works for you too. :-)

@_@ i changing BluetoothRadio.Name .... but ..it not work.. IN WINCE 5.0

:-(  That's life on CE/WM.  Not everything is the same between them, and in particular every CE device can be different.  It's down to the OEM what components and setting he uses into his platform build.  You could speak to the OEM and see if they can add the support.

However I see that we only change a Registry value too, see in BluetoothRadio.cs we set "LocalName" at "\Software\\Microsoft\Bluetooth\\Settings".