尝试以下操作:

ASP.NET中的RadioButtonList控件
将ListItem添加到RadioButtonList
如何以编程方式在RadioButtonList中添加列表项

Try following:

RadioButtonList Control in ASP.NET
Add ListItem to RadioButtonList
How to add list item in RadioButtonList programmatically

查看此链接Asp.NET论坛.以编程方式选择单选按钮 [ ^ ]

See this link Asp.NET forum.Radiobutton Programmatically[^]