title: Submit form on change of dropdown
body: <p>I'm using MVC 3 and razor and have a form in which there is a dropdown.  How do I submit the form when the value in the dropdown changes?  I have no submit button.</p>
  
  <pre><code>@using (Html.BeginForm())
  {
  ...
  
  &lt;div class="row"&gt;
                      &lt;label&gt;
                          Type of Card&lt;/label&gt;
                      &lt;div class="item"&gt;
                          @Html.DropDownList("PaymentFormModel.CardType", cardTypes, new { required = "required" })
                      &lt;/div&gt;
                  &lt;/div&gt;
  ...
  }
  </code></pre>