title: How to activate validators only on button click
body: <p>I'm using Ajax Control Toolkit validators on an ASP.NET page, whose values can be saved by clicking a Submit button. The page can have distinct sections depending on two radio buttons (so the radio buttons have Autopostback set to true). My problem is that when I click the radio buttons to switch sections (so on postback) the validators are activated and appear as red. I don't want this behavior. I want the validation to be done only when the user clicks Submit.</p>
  
  <p>EDIT: The cause was found. Somewhere inside the page, a control was performing Page.Validate().</p>