What's Difference between IsCallback and IsInAsyncPostBack

I can't find any answer yet on google maybe it's a stu开发者_StackOverflowpid question :)

Page.IsCallBack

It is getting a value indicating whether the page request is the result of a call back. Its 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. IsPostBack is true when a method in the code behind posts a page

IsInAsyncPostBack

Gets a value that indicates whether the current postback is being executed in partial-rendering mode.