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Author Topic: !Invalid postback or callback argument!  (Read 7528 times)


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!Invalid postback or callback argument!
« on: June 02, 2010, 05:32:55 pm »
hey there i am trying to make a service for a aspx site i am on the end of script but i get that error.
anyone can help me please?


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Re: !Invalid postback or callback argument!
« Reply #1 on: June 02, 2010, 05:40:46 pm »
Maybe you are sending less form fields than expected by the server.

ASP.NET based pages are worse to be made into services, because each page keeps track of the original data sent by the server, and the browser post data is checked against this verification data to see if its valid.

You may be unable to fix the problem if there is some ASP.NET javascript on the browser that changes something when you select a combo box value or something else (with a postback prior to the final "Submit").

If you can't solve the problem you'd better leave that website alone.