On any Windows Form, you can designate a Button control to be the cancel button. A cancel button is clicked whenever the user presses the ESC key, regardless of which other control on the form has the focus. Such a button is usually programmed to enable the user to quickly exit an operation without committing to any action.
The dialog boxes and menu commands you see might differ from those described in Help depending on your active settings or edition. To change your settings, choose Import and Export Settings on the Tools menu. For more information, see Customizing Development Settings in Visual Studio.
To designate the cancel button
Select the form on which the button resides.
Button Control Overview
Ways to Select a Windows Forms Button Control
How to: Respond to Windows Forms Button Clicks
How to: Designate a Windows Forms Button as the Accept Button Using the Designer