C# how to show a message box if a button is not clicked for a child form

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I have a parent form and a "sign-in button". I coded the "sign-in button" so that if a field is left empty in the parent form, it shows message boxes for each field when clicked. e.g. "this field can't be empty"

but there's also a "second button" that takes me to a child form, to select some options.
Now, what code should I use, if I want the "sign-in button" to also show a message box for the "second button" if the "second button" is not clicked? letting the user know that they haven't visited the child form, to select options.

sign in button = signin_button
second button = visitor_meetingaimbutton

What I have tried:

private void signin_button_Click(object sender, EventArgs e)

{

if (visitor_meetingaimbutton = ??) - what should I use here?
{
MessageBox.Show("Meeting Aim Button Is Not Clicked");
}

}

Posted 10-Mar-22 22:22pm

Two Otaku A

Updated 11-Mar-22 7:17am

v2

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Richard Deeming · Answer 1 · 2022-03-10T22:34:00

Solution 1

Simple:

C#

private bool _secondButtonClicked = false;

private void second_button_Click(object sender, EventArgs e)
{
    _secondButtonClicked = true;
    ...
}

private void signin_button_Click(object sender, EventArgs e)
{
    ...
    if (!_secondButtonClicked)
    {
        MessageBox.Show("Meeting Aim Button Is Not Clicked");
        return;
    }
    ...
}

Posted 10-Mar-22 22:34pm

Richard Deeming

Comments

Maciej Los 11-Mar-22 13:18pm

Fair enough!
5ed!

Two Otaku A 11-Mar-22 18:58pm

Should I execute this in parent form or child form?

Maciej Los · Answer 2 · 2022-03-11T07:17:00

Well, Richard's answer seems to be enough to resolve your issue, but... the correct way to achieve that is described here:
Transferring information between two forms, Part 1: Parent to Child[^]
Transferring information between two forms, Part 2: Child to Parent[^]
Transferring information between two forms, Part 3: Child to Child[^]