What is the difference between Page.IsPostBack and Page.IsCallBack?

Question

I\'ve recently ran into some code that checks Page.IsCallBack but I wasn\'t sure how it is different from Page.IsPostBack. Can anyone enlighten me?

Answer 1

A callback is a special postback, so a round-trip always occurs; however, unlike the classic postback, the script callback doesn't redraw the whole page. ViewState is not updated during a callback, it is for postback.

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