<asp:RadioButtonList ID="RadioButtonList1" runat="server" AutoPostBack="true" OnSelectedIndexChanged="OnRadioChanged">
<asp:ListItem Text="Mango" Value="1"></asp:ListItem>
<asp:ListItem Text="Apple" Value="2"></asp:ListItem>
<asp:ListItem Text="Banana" Value="3"></asp:ListItem>
<asp:ListItem Text="Orange" Value="4"></asp:ListItem>
</asp:RadioButtonList>
<asp:Label ID="lblValue" runat="server" Text=""></asp:Label>
protected void OnRadioChanged(object sender, EventArgs e)
{
lblValue.Text = RadioButtonList1.SelectedItem.Text + " - " + RadioButtonList1.SelectedItem.Value;
}