title: Page.IsValid check internals?
body: <p>I was wondering , how the <code>Page.IsValid</code> gets its value.</p>
  
  <p>If a Page  has  validators  and a submit is occurring , 
  how does the asp.net engine knows if the page was valid or not ? </p>
  
  <ul>
  <li>Does the result from client is kept in a hidden field ? ( I dont think so cause they doesnt generate any hidden fields). Also , I dont think it is kept in view state. cause Client side can add to a view state.</li>
  </ul>
  
  <p>Thanks in advance.</p>