Gets or sets a value indicating whether a Help button should be displayed in the caption box of the form.
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When this property is set to true, a small button with a question mark appears in the caption bar to the left of the Close button. You can use this button to display help for your application. You can create an event handler for the Control.HelpRequested event of the System.Windows.Forms.Control class to display Help information to the user when the Help button of the form is clicked.
The value of the Form.HelpButton property is ignored if the Maximize or Minimize buttons are shown.