what is ispostback?,waht is autopost back?

what is ispostback?,waht is autopost back?

 

Page.IsPostBack()  

ASP.NET pages post back to themselves.

• Page.IsPostBack is a boolean (true/false) value that indicates we have posted back to the page (i.e. we have submitted the form).
• Page.IsPostBack will stop any unnecessary commands from executing multiple times.

For example we may want a function run when the page loads but only if it is loading after

a post back event.

 

Sub PAGE_LOAD()

If Page.IsPostBack then

doMyWork()

End If

End Sub

 

The Page_Load function above calls the doMyWork() function only after a post back event happens.

 

The AutoPostBack Property

• True. When AutoPostBack is True for a control, the control may post back to the server in response to events that you did not want to cause a postback.

 

For example, setting AutoPostBack to True on the TreeView control causes a postback in response to these events: onExpand; onCollapse; onCheck; and onSelectedIndexChange.

• False. By setting AutoPostBack to False, you post back manually in response to a specific event.