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theSCIENTIST View Drop Down
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Points: 440 		Post Options Post Options   Thanks (0) Thanks(0)   Quote theSCIENTIST Quote  Post ReplyReply Direct Link To This Post Topic: IsPostBack
    Posted: 01 August 2006 at 12:57pm
Let me understand this, is it correct to say that, if I use this:
 


If Page.IsPostBack Then


  ... process form POST information ...


Else


  ... theres no form POST information, so run whatever's here ...


End If
 
POST info as in information submited from forms, and I'm assuming only forms submited with POST, not GET.
 
Is my logic correct?
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michael View Drop Down
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Points: 4670 		Post Options Post Options   Thanks (0) Thanks(0)   Quote michael Quote  Post ReplyReply Direct Link To This Post Posted: 01 August 2006 at 4:55pm
Well only HTML forms have Post and Get. In asp.net you don't really need that anymore.
In the page load you usually do something like

Private Sub Page_Load
If Not Page.IsPostback THEN
      BindData()
ELSE
      'Fires on Postback so we may not need to do anything
END IF
END SUB

Private Sub BindData
   'Do some SQL Binding or so
END Sub

Private Sub Button_Click()
'Insert a new Row or something
'This is where Post/Get Logic used to be and it actually fires AFTER the postback so if you don't have the postback in pageload, the data would be re-loaded EVERY time.
END Sub
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scottage View Drop Down
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Points: 15 		Post Options Post Options   Thanks (0) Thanks(0)   Quote scottage Quote  Post ReplyReply Direct Link To This Post Posted: 04 January 2007 at 9:26am
The purpose of testing for IsPostback is so that code that executes on the initial page load (i.e. pre-filling form fields from a database) doesn't happen when the user changes these values and submits the form so the event handler for the button click gets the users values not the database values as Page_Load will fire before the event handlers code
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