title: how to check a particular asp.net validation control is valid?
body: <p>In a web form there are different asp.net validation controls. Is it possible to check a particular validation control is valid ? For example on leaving focus of textbox, first I will check requiredFieldValidatorUserName is valid ? If it is valid then I will check on server using ajax that this user name is not booked already.</p>
  
  <p><strong>Edit:</strong></p>
  
  <p>Explaination: I want to check validity (that input was valid) of a validation control on client side.</p>
  
  <p>Please guide.</p>