title: Dropdown selected default to be the blank option
body: <p>Iam using MVC4, initially my dropdown displays the list of data, 
  My javascript looks like,</p>
  
  <pre><code>  $.each(data, function (value, key) {
              var opt = "&lt;option value=\"" + key + "\"&gt;" + value + "&lt;/option&gt;";
              $("#OwnerAgency").append(opt);
              });
  </code></pre>
  
  <p>How do i set the selected default to be the blank option.</p>
  
  <p>html:</p>
  
  <pre><code>  &lt;div class="SmallTopSpace"&gt;
          &lt;span class="LabelNormal"&gt;Primary Case Agency&lt;/span&gt;
          @Html.DropDownListFor(m =&gt; m.Agencies.AgencyKey, new SelectList(""), "", new { @class = "ImportDropDownMax", @id = "OwnerAgency", @onchange = "OwnerAgencyFunction();" })
      &lt;/div&gt;
  </code></pre>