See Also: Button Members
A System.Windows.Forms.Button can be clicked by using the mouse, ENTER key, or SPACEBAR if the button has focus.
Set the Form.AcceptButton or Form.CancelButton property of a System.Windows.Forms.Form to allow users to click a button by pressing the ENTER or ESC keys even if the button does not have focus. This gives the form the behavior of a dialog box.
You can change the button's appearance. For example, to make it appear flat for a Web look, set the ButtonBase.FlatStyle property to FlatStyle.Flat. The ButtonBase.FlatStyle property can also be set to FlatStyle.Popup, which appears flat until the mouse pointer passes over the button; then the button takes on the standard Windows button appearance.