title: MVC Dropdownlist with unselectable default item
body: <p>I have a simple dropdown list that looks like this:</p>
  
  <blockquote>
    <p>Please Select, Male, Female</p>
  </blockquote>
  
  <p>The "Please Select" is selected by default (on create), but the user must select a value or the validation should fail.</p>
  
  <p>What can I do to achieve this validation on the client-side? [Required] in the model does not seem to work.</p>