title: Cannot find a way to add a placeholder for an MVC 5 DropDownListFor
body: <p>I've tried searching the web and trying out different things with my code. I know how to add a placeholder for a textbox, but how about adding one for an MVC 5 dropdownlistfor?</p>
  
  <p>I have the following code, but will not put the placeholder in the dropdownlist. </p>
  
  <pre><code>@Html.DropDownListFor(model =&gt; model.CustomerID, new SelectList(ViewBag.Customers, "CustomerID", "Email", null, new { htmlAttributes = new { @class = "form-control", @placeholder = "-Select-" } }))
  </code></pre>
  
  <p>What would be the syntax I would need to accomplish this?</p>