title: Why does a failed validation prevent postbacks from control in other validation groups?
body: <p>I have an asp.net web form with several textboxes, buttons, and other controls. One of the buttons is supposed to trigger validation of content in some of the textboxes. This works fine, except that if validation fails, all subsequent postbacks of the page are prevented. Fixing the invalid values gets rid of the error messages, but postback still does not occur. </p>
  
  <p>The validation is occurring within an AJAX UpdatePanel. I'm not sure if that matters or not.</p>