title: how can I understand where this "submit" button/actionlink leads in ASP MVC 4?
body: <p>I am new to ASP.NET MVC 4 and learning my way around an existing MVC 4 code base. I am trying to find the code that processes the the form corresponding to this submit button. I understand that the action link probably says how to process the "submit" button -- but I don't see any constructors that take three strings for an actionlink in the <a href="http://msdn.microsoft.com/en-us/library/system.web.mvc.html.linkextensions.actionlink%28v=vs.100%29.aspx" rel="nofollow">microsoft documentation</a>. </p>
  
  <p>I am confused because there is no action field in the input tag.</p>
  
  <p>How do I find out what happens once the person hits submit? </p>
  
  <pre><code>@using (Html.BeginForm(null, null, FormMethod.Post, new { enctype = "multipart/form-data", @class = "disableSubmit" }))
  {
  ...
  &lt;div class="buttons"&gt;
    &lt;input type="submit" value="Upload" /&gt; | @Html.ActionLink("Back to List", "Index", "Admin")
  &lt;/div&gt;
  }
  </code></pre>
  
  <p><strong>Update</strong> When I go to "view source" to see the raw HTML I see</p>
  
  <pre><code>&lt;form action="/Lab/Upload" ...
  </code></pre>
  
  <p>So that means it goes to the lab/upload controller?</p>
  
  <p>The Javascript for the disable submit looks like this:</p>
  
  <pre><code>// Disable submit button after click
  $(function () {
      $('.disableSubmit').submit(function () {
          if ($(this).valid()) {
              $('input[type="submit"]').attr('disabled', 'disabled');
          }
      });
  });
  </code></pre>