How to create a non-modal form but blocking?

Question

Should sound weird, but this is just for my hobby. I would want a (custom) messagebox to pop up with a YesNo buttons which should ideally block the code. But I should be able to click on the parent form so that I can dismiss the message box without having to specifically click on the messagebox buttons (equivalent to clicking No on the message box)..

something like this:

     void Foo()
     {
         CustomMsgBox.Show("do you really wanna delete?", CustomMsgBox.Buttons.YesNo);
         //block the code here, but user should be able to click on form, so that its equivalent to have clicked No;
         //if clicked No, return;

         //delete.
     }

So the solution I thought was make the custom message box non modal - so that user can click on form, but I'm not able to block code.. How can i do that?

It would look like this:

 void Foo()
 {
     NonModalMsgBox.Show("do you really wanna delete?", CustomMsgBox.Buttons.YesNo);
     //block thread till user clicks on form or messagebox buttons.
     //unblock when user clicks.
     //if No, return;

     //delete.
 }

Edit: I know this is not a standard practice and I know non modal forms do not block, while modal forms do. So please do not recommend to be content with either modal form's or non-modal form's behavior. My question would be is there any way to simulate the behaviour of ContextMenu with windows forms.

Answer 1

You could do something like:

public void ShowMe() {
    Show();
    while (!_receivedDeactivateEvent)
        Application.DoEvents();
}

I'm not sure I'd recommend it, though -- I'm not sure how stable it would be, nor am I sure whether it would behave the way you want if you click the Delete button on the parent form while the 'dialog' is up (would it close the first dialog first, or leave it up? might be the latter, which could get messy).