How to Disable Alt + F4 closing form?

Question

What is the best way to disable Alt + F4 in a c# win form to prevent the user from closing the form?

I am using a form as a popup dialog to dis

Answer 1

This does the job:

bool myButtonWasClicked = false;
private void Exit_Click(object sender, EventArgs e)
{
  myButtonWasClicked = true;
  Application.Exit();
}
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
  if (myButtonWasClicked)
  {
    e.Cancel = false;
  }
  else
  {
    e.Cancel = true;
  }


}