title: W3C validation for server-side form tag
body: <p>I've checked my website html validation in w3.org and got this error</p>
  
  <blockquote>
    <p>Bad value for attribute action on element form: Must be non-empty.</p>
  </blockquote>
  
  <p>but my form is asp.net server-side form and I can't set action atribute.</p>
  
  <p>How can I solve this error?</p>