This method is used primarily by control developers in custom controls that derive from the System.Web.UI.WebControls.RadioButtonList class.

The RadioButtonList.Render(System.Web.UI.HtmlTextWriter) method implementation for a System.Web.UI.WebControls.RadioButtonList control initializes a System.Web.UI.WebControls.RepeatInfo object for the list, and calls the RepeatInfo.RenderRepeater(System.Web.UI.HtmlTextWriter, IRepeatInfoUser, Style, WebControl) method, which in turn uses the RadioButtonList.RenderItem(ListItemType, int, RepeatInfo, System.Web.UI.HtmlTextWriter) method to render individual radio-button list items.

The RadioButtonList.RenderItem(ListItemType, int, RepeatInfo, System.Web.UI.HtmlTextWriter) method for a System.Web.UI.WebControls.RadioButtonList control ignores the itemType and repeatInfo parameters. The repeatIndex parameter value is used to select the radio button list item in the ListControl.Items collection, and the selected list item is rendered to the output stream.