A postback is when the page is returned to the server to evaluate code handlers, and the same page is sent back to the browser afterward.
The first type of postback in AJAX is synchronous, in which the entire page is sent back to the server, as with a non-AJAX page. The second type is asynchronous, in which only part of the page is updated, and the rest is unaffected.
The ID property. The IDE sets this property for you (although you can change it), and you need it to refer to the control from elsewhere on the page.
TextBox control with the
TextMode property set to
ListBox control, which allows
multiple selections and is best for long lists.
GroupName property of each
radio button to the same group.
Panel control groups other
controls together in one place, and enables you to make all the controls
visible or invisible as a whole.
SelectedItem property retrieves
Text property of the currently
selected item of the control.
Set the control's
to false. The control will be present, but won't be rendered until
something changes the
Target property to
Exercise 2-1. This exercise isn't too tricky; you're just getting used to
adding controls to the page, and seeing how nested
UpdatePanel controls work. If the labels aren't updating independently of each other, make sure you have the buttons and labels inside ...