The RadioButton List is used when the number of items in the list is small, and the user is allowed to select one item in the list. The procedure for adding a RadioButton List is the same as for the Checkbox List. The only two differences are:

1. There can only be one selected item in the List Items form, whereas the Checkbox List can have multiple items selected in the List Items form.Â
2. The Required Field Validator can be used to require that a user make a selection.

We will add a Required Field Validator to this RadioButton List in the Validation section