“Invalid postback or callback argument” in ASP.NET

re: “Invalid postback or callback argument” in ASP.NET

Nirav Bhatt — Thu, 19 Aug 2010 06:11:03 GMT

Nice post. Thanks for sharing.

Check out url www.aspnetajaxtutorials.com/.../invalid-postback-or-callback-argument.html as well.

re: “Invalid postback or callback argument” in ASP.NET

Carlo Cardella — Fri, 27 Nov 2009 08:53:00 GMT

Pete, have you considered calling our Support to seek assistance? This error, as every error can have a lot of different underlying causes, influenced by different configurations and environments... Reading your comment my feeling is that there is need to have a close look at the specific page on this specific server, there is not general advice always available.

I would not turn input validation off, your right that is developer's responsability to ensure returned data is correct, but if the server can help, why not? I would not give up security layers unless absolutely forced to.

HTH

re: “Invalid postback or callback argument” in ASP.NET

Pete — Fri, 27 Nov 2009 08:46:03 GMT

I'm currently fighting with this error and cannot reproduce it reliably on my development machine. It seems to happen sporadically once installed on a customer's server. This page has given me food for thought, but I'm thinking about turning page validation off. Other web development languages do not have this facility builtin as standard (Java, PHP, etc) to my knowledge, not when I worked with them, it's up to the developer to ensure the returned data is correct.

A bug has never driven me up the wall as much as this one.

re: “Invalid postback or callback argument” in ASP.NET

Eric — Wed, 16 Sep 2009 16:51:52 GMT

This was happening to me because I was loading a dynamic DropDownList with an invalid value.

I had the AJAX CascadingDropDown extender on a couple of dynamically created DropDownLists, where a selection in one would populate the other. The default value in the first would generate a list in the child which didn't contain the default value I was assigning it ... poof ... validation problem on all postbacks.

re: “Invalid postback or callback argument” in ASP.NET

Adam — Tue, 23 Jun 2009 18:10:37 GMT

I know I am a year behind you all but this has just made my day. Thank you from a happy english developer.

re: “Invalid postback or callback argument” in ASP.NET

Ramprasad — Fri, 29 May 2009 10:21:12 GMT

Oh dear... you saved me a lot.....lot.... of time..

Thank you very much.

re: “Invalid postback or callback argument” in ASP.NET

Vivek — Tue, 26 May 2009 13:48:25 GMT

Just add this to your web config and make pages..like ErrorPage.aspx , and see you will control this error by making your custom control error.

<system.web>

<system.web>

re: “Invalid postback or callback argument” in ASP.NET

Sid — Mon, 13 Apr 2009 23:13:00 GMT

Thanks for this post. Helped a lot !

re: “Invalid postback or callback argument” in ASP.NET

JAMC — Sun, 15 Mar 2009 17:11:19 GMT

I struggled with this problem for days, but with much experimentation have managed to sort my problem out. As the number of potential causes for this error seems quite high, I don't know whether this will help anyone, but here goes...

1. Check whether you're using a Page.Validate call.

2. More importantly check the positioning of the Page.Validate call in your code execution sequence. I had placed my Validate call too late in the code execution - i.e. I was making changes between the Page_Load and Page_PreRender events that the Page.Validate call did not like. Place the Page.Validate call as early as possible, so that the call is validating the original data sent by the postback, not the data you've altered after the postback.

re: “Invalid postback or callback argument” in ASP.NET

Mick — Thu, 05 Mar 2009 23:07:02 GMT

THANK YOU for this post on "Invalid postback or callback argument" errors. I too didn't see the Nested <form> tags cause mentioned anywhere else. It seems that my error was the result of an outdated Google search box I was using prior to moving to ASP.Net.

BTW, it does not happen running locally using VWD, only with remote host. Also I agree from the earlier comment that a postback generated from within the nested form seemed to work fine - in my case the search action.

Thanks again! :-)