By tag: RadioButtonList
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We often need to require a user select an item in a RadioButtonList, or any other web control derived from ListControl. Often an uninitiated programmer will add a RequiredFieldValidation control to their form and set the ControlToValidate property to the RadioButtonList in question.
The title says it all, except that the example code includes a ModalPopupExtender which contains the RadioButtonList. The onclick event populates a TextBox on the page.