C#

private void AddService()
{
    // Create an instance of a service and add it to the list of services
    MyService service = new MyService();
    _services.Add(service);

    // Subscribe to the services' status event.
    service.StatusChanged += Service_StatusChanged;

    // Write a message to the UI
    AddStatus(string.Format("Service '{0}' created", service.ServiceId));

    // Start the task
    var newTask = Task.Factory.StartNew(() =>
    {
        service.Start();

    }, service.CancellationTokenSource.Token)
        .ContinueWith(task =>
        {
            switch (task.Status)
            {
                // The task ran to completion
                case TaskStatus.RanToCompletion:
                    AddStatus(string.Format("Service '{0}' completed", service.ServiceId));
                    break;

                // The task was cancelled
                case TaskStatus.Canceled:
                    AddStatus(string.Format("Service '{0}' cancelled", service.ServiceId));
                    break;

                // The task threw an exception
                case TaskStatus.Faulted:
                    AddStatus(string.Format("Service '{0}' errored", service.ServiceId));
                    AddStatus(task.Exception.ToString());
                    break;
            }

            // Remove the service
            App.Current.Dispatcher.Invoke(() =>
            {
                // Remove the model from the UI
                Services.Remove(SelectedService);
                SelectedService = null;
            });

            // Remove the service from the list of services
            _services.Remove(service);

            AddStatus(string.Format("Service '{0}' removed", service.ServiceId));
        });
}

Services.Remove(SelectedService);
SelectedService = null;