protected void OnButton1Clicked(object sender, EventArgs e)
    {
        ObjectPath opath = new ObjectPath("/org/example/TestObject");
        string     name  = "org.example.TestServer";

        Bus bus = Bus.Session;

        sample = bus.GetObject <ITestInterface>(name, opath);

        int teste = sample.Adder(5, 12);

        label1.Text = Convert.ToString(teste);
        label2.Text = sample.Ping();
        string teste3 = sample.Echo("Hello dbus");
    }