title: how to bind multiselect dropdown to asp.net controller action parameter
body: <p>i have a html form which posts to a asp.net-mvc controller action and previously worked fine. i just added a new multiselect dropdown (using the fcbkcomplete jquery plugin) and i am having problems binding it to a new property that i just added of my binding object</p>
  
  <p>i am just listing:</p>
  
  <pre><code> &lt;select id="SponsorIds" name="SponsorIds"&gt;&lt;/select&gt;
  </code></pre>
  
  <p>in the html but it looks like fcbkcomplete somehow changes this to name="SponsorIds[]".</p>
  
  <p>This is the  html i get after showing "<strong>Selected Source</strong>" in the browser.</p>
  
  <pre><code>&lt;select multiple="multiple" style="display: none;" id="SponsorIds" name="SponsorIds[]"&gt;
  </code></pre>
  
  <p>here is all of the html that gets spit out from the plugin</p>
  
  <pre><code> &lt;select multiple="multiple" style="display: none;" id="SponsorIds" name="SponsorIds[]"&gt;
  &lt;option class="selected" selected="selected" value="9"&gt;MVal&lt;/option&gt;
  &lt;/select&gt;
  &lt;ul class="holder"&gt;
  &lt;li rel="9" class="bit-box"&gt;MVal&lt;a href="#" class="closebutton"&gt;&lt;/a&gt;&lt;/li&gt;
  &lt;li id="SponsorIds_annoninput" class="bit-input"&gt;&lt;input size="1" class="maininput"    type="text"&gt;&lt;/li&gt;
  &lt;/ul&gt;
  &lt;div style="display: none;" class="facebook-auto"&gt;
  &lt;ul style="width: 512px; display: none; height: auto;" id="SponsorIds_feed"&gt;
  &lt;li class="auto-focus" rel="9"&gt;&lt;em&gt;MVal&lt;/li&gt;&lt;/ul&gt;&lt;div style="display: block;" class="default"&gt;Type Name . . .
  &lt;/div&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>and here is my controller action:</p>
  
  <pre><code> public ActionResult UpdateMe(ProjectViewModel entity)
      {
      }
  </code></pre>
  
  <p>The view model, ProjectViewModel has a property:</p>
  
  <pre><code>   public int[] SponsorIds { get; set; }
  </code></pre>
  
  <p>which i thought would bind fine to this but doesn't seem to as it just shows up as "null" on the serverside.  Can anyone see anything wrong here?</p>