:) No, that's not what he means.
In the button postback=true will trigger a postback, yes.
Now you want the code behind to do different things if the page is postback or not. Typically you break items up into three groups like this...
protected void Page_Load(...blahblah...)
... This is code you always want executed whether the page is postback or not...
...Code that should only execute if the page IS postback...
...Code that should only execute if the page id NOT postback, the exclamation point means "not"...
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