title: Uploaded HttpPostedFile is null
body: <p>On the View: </p>
  
  <pre><code>&lt;% =Html.BeginForm("About", "Home", FormMethod.Post, new {enctype="multipart/form-data "})%&gt;
    &lt;input type="file" name="postedFile" /&gt;
    &lt;input type="submit" name="upload" value="Upload" /&gt;
  &lt;% Html.EndForm(); %&gt;
  </code></pre>
  
  <p>In the Controller, there's something like this:</p>
  
  <pre><code>[AcceptVerbs(HttpVerbs.Post)]
  public ActionResult About(HttpPostedFile postedFile)
  {
      //but postedFile is null 
      View();
  }
  </code></pre>
  
  <p><code>postedFile</code> is null in About(). How do I upload the file?</p>