You can let the server decide whether to select an HTML radio button when the form is displayed in a browser.
If you want to dynamic preselect ASP.NET radio button objects such as RadioButton or RadioButtonList controls, see Dynamically preselecting an item in an ASP.NET RadioButtonList.
Before you begin, you must create the form in a ColdFusion, PHP, ASP, or JSP page, and insert at least one group of HTML radio buttons (see Inserting HTML radio buttons). You must also define a recordset or other source of dynamic content for the radio buttons. For more information, see Defining a recordset. Ideally, the source of content should contain Boolean data, such as Yes/No or true/false.
The Dynamic Radio Group dialog box appears.
For instructions, see Setting the Dynamic Radio Group dialog box options or Setting the Dynamic Radio Group dialog box options (ColdFusion, ASP.NET).