title: Change label on change DropDownListFor value
body: <p>I use a <code>DropDownListFor</code> and a label text on my page.</p>
  
  <pre><code>&lt;%=Html.DropDownListFor(x =&gt; x.MotiveClientType,
                          new SelectList(
                              Model.ClientMotives, "Id", "Label", Model.MotiveClientType),
                          new { id = "ddlMotiveClientType" }
  )%&gt;                       
  </code></pre>
  
  <p>How can I change my label when selecting value on my <code>DropDownListFor</code>?</p>