Fortunately it is very simple to interact with Bluetooth radio and devices on the phone using Windows Embedded Source Tools for Bluetooth Technology. This download contains a bunch of C# files which you can directly use in your code. You will get classes such as BluetoothDevice and BluetoothRadio which allow you to control the device and paired devices.

read more: blogs.msdn.com – bluetooth-device-control-development-using-c#