I have more than one fields to validate as required fields in a form. I have put required field validator for all the fields i want to validate and also put ajax control toolkit validator callout extender for each of them. validation is working fine, but problem is that error message of only first field is popping up when i click submit button. when i fill the first field and again click the submit button, submit action is not taking place but error message is not popping up. it pops up only when i click respective fields.