MVC Windows Form

Question

I am using MVC in Windows Forms. I have a question regarding wizards/dialogs/error_msgs in MVC that is where should I call the wizards/dialogs/error_msgs

i. show from controller
ii. notify the view from controller to show dialogs/wizards/error_msg

Which approach is correct?

    class Controller
{
    IView view;

    public void DoSomthing() 
    {
        // i) approach

        Wizard wz = new Wizard();
        wz.Show();

        MessageBox.Show("Error while DoSomething");


        // ii) approach

        view.ShowWizard();

        view.ShowErrorBox();
    }
}

Answer 1

Although I agree with @StealthRabbi's comment, you should be more specific, and explain what is wizards/dialogs/erros_msgs, from your code I assume, you want to know, whether you should directly create and show Wizard window from controller or ask view to show it. Clearly the answer is ii) option, all UI related stuff should be done by view. Showing Wizard window is UI related stuff, so controller shouldn't directly create Wizard, but rather ask view to do that. So your code should go like this

class Controller
{
    IView view;

    public void DoSomthing() 
    {
        // ii) approach

        view.ShowWizard();

        view.ShowErrorBox();
    }
}