Don't want to exit program when user click on Close button in titlebar of C# app

Question

Working on development of C# application.

I want to keep Close button on top right in title bar, but if end users click on it, all I want is that he gets info window that he can not close application until some other proper button.

Is it possible to achieve?

Tnx in adv!

Answer 1

Add an event handler to the OnClosing event of the form. The event argument contains an element Cancel . Set it to true and it won't close.

Essentially something like this:

private void Form1_Closing(object sender, System.ComponentModel.CancelEventArgs e)
{
    e.Cancel = !stuffdone;
}

Answer 2

You can handle the FormClosing event event handler like this

private void Form_FormClosing(object sender, FormClosingEventArgs e)
{
    //there can be other reasons for form close make sure X button is clicked
    // if close button clicked
    if (e.CloseReason == CloseReason.UserClosing)
    {
        e.Cancel = true;
    }
}