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Why onClick response.redirect to same page do isPostBack on PageLoad equal false?

Posted on 2010-11-14
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Last Modified: 2012-05-10
Why onClick response.redirect to same page do isPostBack on PageLoad equal false? How do i make it equal true? thanks.

it seems autopostback=true works on the first page load after onclick button, but at the end of code after page redirect to same page, page load starts again with is postback false.
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Question by:kitesurf
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12 Comments
 
LVL 10

Expert Comment

by:hosneylk
ID: 34133946
because it's not a postback. instead it triggers an HTTP GET from the browser. Not a POST. to make it equal to true you'll have to make a POST. so don't do a response.redirect. simply let the form submit itself which is the default behavior.
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LVL 23

Expert Comment

by:Rajkumar Gs
ID: 34133954

If you really want to do the PostBack from the same page, do a trick like this. But it will work.

First redirect to a temporary page. (something like 'Redirect.aspx')
Then in the pageload of that page, write code to redirect to your actual page (previous page)

Regards
Raj
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LVL 2

Expert Comment

by:getnitincr
ID: 34133962
I don't think IsPostBack should ever be true if the page is being hit from a
Response.Redirect. Response.Redirect sends back a HTTP/302 to the browser.
When receiving a HTTP/302 in response to a HTTP POST, a properly behaving
client (e.g. IE) will perform a HTTP GET on the new URL and thus will not
POST the form data to the new page.

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LVL 2

Expert Comment

by:getnitincr
ID: 34133969
the step involved:    If your doing a Response.Redirect the it is NOT considered a postback.  The response.direct starts a whole new page request.  So if you your button is doing that the order of operations is happening like this:

Button Clicked
Page_Load (IsPostBack = true)
Button Event Code Runs
Response.Redirect Fires
Page_Load (IsPostBack = false, because you did a response.redirect)
Done.
0
 
LVL 2

Expert Comment

by:AarthiPrabakaran
ID: 34133981
Hi,
Use session variable to find whether ispostback or not ..

before redirecting set session variable to true  . so on page load u can check it .
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LVL 1

Author Comment

by:kitesurf
ID: 34134045
thanks for the responses.  i will try the session variable.  this could get messy in sharepoint.  on click i pass variables in response.redirect so when page loads and ask ispostback , i need it to say true to bypass any code that would use the variables in the url to update database.  any other ideas.  
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LVL 10

Accepted Solution

by:
hosneylk earned 2000 total points
ID: 34134050
add another parameter to the url saing that the update should be bypassed
0
 
LVL 2

Expert Comment

by:AarthiPrabakaran
ID: 34134053
use quertstring while redirecting
0
 
LVL 2

Expert Comment

by:AarthiPrabakaran
ID: 34134055
REsponse.Redirect("home.aspx?var=true",false);
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LVL 2

Expert Comment

by:getnitincr
ID: 34134094
apart from url ,session to store state you can also use hidden field.....
0
 
LVL 1

Author Comment

by:kitesurf
ID: 34134102
sounds good hosneylk.  what does the comma false mean at the end of the response.redirect hosneylk?
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LVL 1

Author Closing Comment

by:kitesurf
ID: 34134115
good
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