title: How to preserve values when asp.net MVC validation got errors?
body: <p>I noticed that if there is an error when submit the form, it shows validation error message, that's cool. However, it doesn't keep my entered values. Actually, they are disappeared and even worse thing is datepicker won't work either. So, I couldn't use picker any more. 
  So, my questions are:</p>
  
  <ol>
  <li>how to preserve the values that I've entered before validation?</li>
  <li>if possible, any way to reuse picker control after validation error happened?</li>
  </ol>