how to connect windows application using bluetooth to mobile devices in C#

[DllImport("bLADEBluetoothLib.dll",
  EntryPoint = "discoverbluetoothdevices",
  CharSet = CharSet.Unicode,
  SetLastError = true)]
private static extern int DiscoverBluetoothDevices(String deviceList);

[DllImport("Ws2.dll",
  SetLastError = true)]
private extern static Int32 WSAGetLastError();

public static string[] GetDiscoverableDevices()
{
  // prepare a 500 character buffer for the DLL to return
  //  the result in
  String deviceList = new String(' ', 500);

  // get a comma-separated list of
  // discoverable Bluetooth devices
  //
  // the number of devices is returned
  int nbrDevices = DiscoverBluetoothDevices(deviceList);

  if (nbrDevices >= 0)
  {
    return deviceList.ToString().Split(new char[] { ',' });
  }
  else
  {
    // if the DLL encounters an error in one of the WinSock
    //  functions it uses, it returns -1
    //
    // you can then use WSAGetLastError to find the source
    //  of the error
    MessageBox.Show(nbrDevices.ToString() +
            " (reason: " + WSAGetLastError() + ")");
    return new string[0];
  }
}