What's the purpose of IsPostBack?

[TheBugSlayer]

Hi all.
I have been trying to understand the purpopse of IsPostBack function for sometime now and I haven't been able to come up with a convincing explanation.

Can someone explain it to me? When the condition is checked in the Page_Load event, what is it for?

Any help is appreciated.

 

[JohnYingling]

To know whether this is the user's first request for a page or that this is "post-back" of the page with data provided by the user.

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[Custom24]

John's explanation is perfect. Typically, you would use this kind of thing in the page_load event

If not page.ispostback then
.. do some databinding or initial page set up here
end if

The reason being that the initial page processing is persisted across subsequent postbacks by the viewstate, so there is no need to do it again.

Hope this helps

Mark

 

[TheBugSlayer]

Thank you. I understand better now. I played around with it and it worked.