If the Checked value is set to false, the RadioButton portion of the control must be checked in code in the Click event handler. In addition, if the RadioButton is part of a RadioButton control group, this property ensures that only one of the controls is checked at a given time.
If the AutoCheck property is set to false, a group of RadioButton controls will not act as a mutually exclusive group and the Checked property must be updated in code.
// Create and initialize a new RadioButton.
RadioButton radioButton1 = new RadioButton();
// Make the radio button control appear as a toggle button.
radioButton1.Appearance = Appearance.Button;
// Turn off the update of the display on the click of the control.
radioButton1.AutoCheck = false;
// Add the radio button to the form.
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)