class AskValues : Action
    {
        public override void DoAction()
        {
            if (String.IsNullOrEmpty(this.VariablesToSet))
            {
                throw new ActionException("No variables listed", this);
            }

            Form form = new Form();

            // add controls to form

            form.FormClosed += delegate
                               {
                                   switch (form.DialogResult)
                                   {
                                   case DialogResult.OK:
                                       // do stuff
                                       break;
                                   case DialogResult.Cancel:
                                       throw new FatalActionException("Cancel Clicked", this);
                                   }
                               };

            MainWindow.Invoke(new Func<Form, DialogResult>(form.ShowDialog), MainWindow);
        }


    class MainWindow : Form
    {
        private RunButton_Clicked(object sender, EventArgs e)
        {
            this.backgroundWorker1.RunWorkerAsync()
        }

        private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
        {
            Core.RunJob();
        }

        public ApplicationCore Core;

    }

    class ApplicationCore
    {

        public void RunJob()
        {
            CurrentAction = Actions.First();

            while (CurrentAction != null)
            {
                if (!RunStep(CurrentAction))
                    break;

               CurrentAction = CurrentAction.GetNext();
            }
        }
        private void RunStep(IAction currentAction)
        {
            try
            {
                currentAction.DoAction();
                OnAfterAction(args);

                return true;

            }
            catch (FatalActionException e)
            {
                // handle error
                return false;
            }
        }
    }