Thursday 14 August 2008

Invalid postback or callback argument in ASP.Net 3.5

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Also, you might get a Sys.WebForms.PageRequestManagerServerErrorException with code 500 when using Ajax. It usually happends when you click on a button in a GridView or another bound control. You expect it to work, but it doesn't, even if the code is relatively clear.

The answer is (probably) that you are binding the container bound control every time you load the page (instead of only on !IsPostBack). The thing is this used to work in ASP.Net 2.0.

Bottom line: check your binding, see if you are not doing any DataBind in between the button click and the eventual event catch.

12 comments:

  1. Anonymous30 December 2008 at 11:34

    Hey, this was a very helpful post.. that problem was a real head scratcher for me, but you showed me the way :) Thanks much!

    ReplyDelete
  2. Shelly21 January 2009 at 23:34

    Thank you. Fixed my problem exactly as you described.

    ReplyDelete
  3. joseph jelasker22 April 2009 at 04:22

    hey,really i was very helpful for me.
    within simple snippet of information you have solved my problem.Thanks a lot

    ReplyDelete
  4. Jason S.30 November 2009 at 21:01

    Great post! I've been scratching my head on this one for a while. Thing was, on some of my pages it worked and others it didn't. I'd been scouring over the differences between them for a while and I guess it wasn't obvious enough. Thanks for this!

    ReplyDelete
  5. Anonymous20 December 2009 at 11:50

    Hey there,

    I couldn't go off this post without thanking you. You saved me from a horribly embrassing meeting. I had to get this thing done and got stuck with very problem you addressed.
    You rock bud

    ReplyDelete
  6. Anonymous25 February 2010 at 09:00

    Thank's

    ReplyDelete
  7. sadık28 April 2010 at 23:25

    thank you man it is realy helpful for me also

    ReplyDelete
  8. BKahuna6 April 2011 at 14:56

    Saved me a ton of time - thanks!

    ReplyDelete
  9. Anonymous21 August 2011 at 22:05

    This is an awesome post. It saved my life.

    ReplyDelete
  10. Robert Firegarden6 October 2011 at 19:34

    Bravo... simply Bravo!

    ReplyDelete
  11. Robert6 October 2011 at 19:36

    Bravo! Simply Bravo.
    Slow clap..... clap..... clap

    ReplyDelete
  12. sampath online27 April 2012 at 04:43

    I have used ispostback for binding but still have got the error twice in between and it's not reproduced now.. :-(

    ReplyDelete