C#

private bool OBEXOpenStream(string BTMAC)
        {
            // serial port UUID
          // Guid spguid = OpenNETCF.Net.Bluetooth.BluetoothService.ObexObjectPush;
            Guid spguid = new Guid("{(uuid128=F9EC7BC4-953C-11D2-984E-525400DC9E09)}");
            btaddress = OpenNETCF.Net.BluetoothAddress.Parse(BTMAC);
            client = new OpenNETCF.Net.Sockets.BluetoothClient();
            // define endpoint
            endpoint = new OpenNETCF.Net.BluetoothEndPoint(btaddress, spguid);

            try
            {
                //open socket
                client.Connect(endpoint);
            }
            catch (System.Exception e)
            {
                //unable to connect (server not listening on spguid)
                return false;
            }

            //connect socket
            stream = client.GetStream();
            return true;
        }

[Guid("9E88FA9A-4E7D-4bba-8D94-439BFA2B0AEC")]

[ClassInterface(ClassInterfaceType.AutoDual)]
[ComVisible(true)]
public class MyFunctions
{
    public void test()
    {
        Microsoft.Office.Interop.Excel.Application xlsApp = new ApplicationClass();
        Worksheet ws = (Worksheet)xlsApp.ActiveSheet;
        ws.Cells[1, 1] = "Edited by C#";
    }

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