How can you disable the “X” button on a Windows Form so that user has to click a Close button on the form to close the window?
You may say just set ControlBox=False for the Form. But it will hide all the buttons, including the minimize and the maximize button. What if you still want user to be able to minimize/maximize the window?
Jose Luis Manners described a very simple but slick way to accomplish this task by overriding CreateParams method.
Here is the code:
protected override CreateParams CreateParams
const int CS_NOCLOSE = 0x200;
CreateParams cp = new CreateParams();
cp = base.CreateParams;
cp.ClassStyle = cp.ClassStyle | CS_NOCLOSE;