Hi Guys, i have a group of Radio buttons and i need to check if one has been clicked if not then throw an erorr how can i validate the below....

<legend>Follow Opening Script?</legend>
                <p><strong><asp:RadioButton GroupName="OpeningScript" CssClass="inline-radio" ID="rdoOpeningScriptYes" runat="server" Text="Yes" TextAlign="Right" /></strong>&nbsp;&nbsp;
                   <strong><asp:RadioButton GroupName="OpeningScript" CssClass="inline-radio" ID="rdoOpeningScriptNo" runat="server" Text="No" TextAlign="Right" /></strong>
                </p>