(In which AJAX-enhanced CheckBoxes become more useful than RadioButtons but inheritance saves the day, and a simple RadioButton-derived control establishes the purpose of a control's naming container)
The RadioButtonList. Very handy for inviting users to select just one item from a list although because of the screen real estate it takes up, used less and less in favour of the DropDownList. In plain HTML, the browser knows to enforce the unique selected value amongst a list of radio buttons because they all have the same value for their name attributes.
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