How to check whether any of the radiobutton selected or not?

[code]
using System;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}
protected void RadioButtonList1_SelectedIndexChanged(object sender, EventArgs e)
{
string str;
if (RadioButtonList1.SelectedIndex != -1)
{
str = RadioButtonList1.SelectedItem.Text.ToString();
Response.Write(str);
}


}
}


<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %&>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"&>

<html xmlns="http://www.w3.org/1999/xhtml"&>
<head runat="server"&>
<title&>Untitled Page</title&>
</head&>
<body&>
<form id="form1" runat="server"&>
<div&>
<asp:RadioButtonList ID="RadioButtonList1" runat="server" AutoPostBack="True"&>
<asp:ListItem&>ABC</asp:ListItem&>
<asp:ListItem&>AB</asp:ListItem&>
<asp:ListItem&>A</asp:ListItem&>
</asp:RadioButtonList&>
</div&>
</form&>
</body&>
</html&>

[/code]

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