How Do I Add Items In Radio Button Dynamically Using Items.Add(Item)

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ASP.NET

I tried to add radio button list items dynamically with code and i got this error:

'System.Web.UI.WebControls.RadioButton' does not contain a definition for 'Items'and no extension method 'Items' accepting a first argument of type 'System.Web.UI.WebControls.RadioButton' could be found (are you missing a using directive or an assembly reference?)
my code is:
<asp:RadioButton ID="lstBorder" runat="server" Width="177px" Height="59px" />


protected void Page_Load(object sender, EventArgs e)
{
if (!this.IsPostBack)
{
ListItem item = new ListItem();
item.Text = BorderStyle.None.ToString();
item.Value = ((int)BorderStyle.None).ToString();
lstBorder.Items.Add(item);
}
}

I would appreciate if you could help me. I even didnt get the part if Items is not a property in radio button list? how could i fix it?