winforms Handling HelpButtonClicked event of Form


You can detect when a user Clicked on a HelpButton on title-bar of form by handling HelpButtonClicked. You can let the event continue or cancel it by setting Cancel property of its event args to true.

private void Form1_HelpButtonClicked(object sender, CancelEventArgs e)
    e.Cancel = true;
    //Perform some custom action
    MessageBox.Show("Some Custom Help");