title: ASP.NET MVC 4 Required Validation client side on Radio Buttons
body: <p>I have a series of radio buttons, one must be selected whent he user clicks the submit button:</p>
  
  <pre><code>@Html.RadioButtonFor(o =&gt; o.EquityOrder.OrderAction, EnumOrderAction.B, new {id = "actionBuy"})
  @Html.RadioButtonFor(o =&gt; o.EquityOrder.OrderAction, EnumOrderAction.S, new {id = "actionSell"})
  </code></pre>
  
  <p>Is there a way to ensure that the form doesn't submit and the  @Html.ValidationSummary() is populated with a "OrderAction must be selected" string?</p>