pzn3xq wrote:1) So do partial page updates only target controls that reside within an Update Panel?
I am confussed by what you mean with this.
pzn3xq wrote:2) Even if a partial page update occurs, isn't a postback really truely occurring behind the scenes? Your browser doesn't appear to do a full postback and blink, but I'm guessing it is still doing a postback.
That's the point and beauty of Ajax is that it is behind the scenes. To view the 'response' from the server when an Ajax is being used use a Firefox add-on called Firebug. Example Screenshot.