Disabling controls during a postback

Have you ever wondered how to disable the controls in the UI when doing a postback? This is a way to give feedback to the user saying: "wait for the page to load/respond". There are other ways to give this kind of feedback, for example, by using a busy indicator. The article "Managing the User Experience in AJAX" shows how to handle the first situation:

msdn.microsoft.com/en-us/magazine/cc163319.aspx