Question

I would just like to know how to run code in vb.net when the program is closed with the red cross in the top right of the screen.

Answer 1

Use Form.FormClosing Event – Read the Remarks on this event documentation for better implementation of your functionality.

It occurs before the form is closed.

Check FormClosingEventArgs properties for further manipulations:

e.CloseReason

e.Close

However, canceling the event will set to true the Cancel property of
the FormClosingEventArgs class that is passed as a parameter to the
parent form. To force all MDI parent and child forms to close, set the
Cancel property to false in the MDI parent form.

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            sr.WriteLine("8 - FormClosing");
        }

Windows Forms Events Lifecycle