Invalid Callback Or Postback Argument

I wrote an ASP.NET 2.0 web page, which populates a drop down list according to the user input values. I put the drop down list into an AJAX UpdatePanel, which is triggered by some server controls. But when I try to run it, the following error prompts out:

Invalid postback or callback argument. Event validation is enabled using <pages enableeventvalidation="true" /> in configuration or <%@dotnet.itags.org. page enableeventvalidation="true" %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.

Anybody knows how to solve it?

hello.

can you build a small demo page that reproduces this problem and put it here?

thanks.

Invalid postback or callback arguement?

Hey, i have a page with a gridview in an update panel, which has a triggered by the user clicking button1, the gridview has a row_command that deletes the data in the gridview, the code worked fine before i added the update panel, but now i tested my page again, i clicked button1, and then tryed to delete the new item in the gridview.

I got the error message "Event validation is enabled using <pages enableEventValidation="true"/> in the config or in the page head.

My page head bit reads :

<%@dotnet.itags.org. Page Language="C#" MasterPageFile="MasterPage.master" EnableEventValidation="true" AutoEventWireup="true" Inherits="Masters_Default2" Title="Untitled Page" %>

But i still get the error,... where am i going wrong? thanks Si!

Have a look at this blog:http://blogs.msdn.com/amitsh/archive/2007/07/31/why-i-get-invalid-postback-or-callback-argument-errors.aspx

-Damien

Make it false and then try...

Let me know what happend

Invalid postback or callback argument

I keep logging several errors listed below. I have atlas running on my site with update panels on several pages. This error seems to occur if the user uses the browser "Back" button. Is there a way to handle or prevent this error?

Error on Page: /NewestMembers.aspx Error Date/Time: Aug 29, 2006 - 6:57:37 AM Error Message: Invalid postback or callback argument. Event validation is enabled using in configuration or in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation. Error Source: System.Web Session Variables: Query String Variables: Form Variables: __EVENTTARGET = ctl00$_MainContentPlaceHolder$_NewestMembersGridView __VIEWSTATE = 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 __EVENTVALIDATION = 2YRA4zH2000xi7Lksp82pi1+tHABGzOHht7Et+u77Weu3g/BHP9mPNIn43W1htX8pl8A+lgBfwaLZ1wEqFInQUSD95SpvsF87mANctA9ZJk= __VIEWSTATEENCRYPTED = ctl00$_MainContentPlaceHolder$ScriptManager1 = ctl00$_MainContentPlaceHolder$_upNew __EVENTARGUMENT = Page$2 __PREVIOUSPAGE = zubEIIwaLs1mi-rZEVX2KuSBbYvdLRKqzF9n-nadHR81 Error Stack Trace: at System.Web.UI.ClientScriptManager.Valid ateEvent(String uniqueId, String argument) at System.Web.UI.Control.Valid ateEvent(String uniqueID, String eventArgument) at System.Web.UI.WebControls.GridView.RaisePostBackEvent(String eventArgument) at System.Web.UI.WebControls.GridView.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postD ata) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

Hi,

I don't know your scenario but you could try to give a look tothis article by Joteke and see if it could be your case.

All of my pages are using the object datasource. I'm not doing any manual databinding.

Any other ideas out there?

Thanks for your suggestion

I have the same problem.

Here is my scenario. I have an update panel along with an AutoCompleteExtender. I have a DropDownList with an autopost back to make changes to the ContextKey property of the AutoCompleteExtender on SelectedIndexChange. which is causing me to get the post back error.

Any fixes for this?

Thanks,
Kam

Invalid postback or callback argument on page back

Hello,

I ran into this by placing myselft as the final user of my web application.

I have several pages using AJAX controls (update panel, autocomplete extender, etc), and I noticed that when I have redirect to another page, and till there, using the IE back page button, the previous page is loaded and then a message error is prompt (Invalid postback or callback argument)

By now I'm disabling the - PageEventValidation - but, actually I'd like to solve it in a better way.

Thanks in advance guys,

Hi Manotas,

Do you have databound controls, like a DropDownList or a GridView? If so, did you make sure they are initialized in a block that checks for inital page load?

For example:

if (false == Page.IsPostBack)

{

// code for initial load goes here

}

else

{

// code for PostBack from same page goes here

}

Pete

Hi Peter,

Thanks for reply.
I do have bound control. After reading at your post, I checked the initialization of my databound controls.
I realized that there is a gridview which I am initializing at first loading but not during postbacks, however, when the page is reload by using the back button on the browser, there is a postback and maybe is there where is my error. The thing is that I'm not sure what kind of validation I could do there since I wouldn't like to change the data of the parameters used on the select's datasource ...

I tried to find a pattern on the error... I must correct what I said about the invalid postback after the page's loading. In fact, I realized that it was happening only sometimes, and only when I was clicking on certain linkbuttons, on the other side, if I click on others buttons I was not having any problem at all. Also, as you mentioned the fact of look at databoud controls, I began testing and I found that I was getting the error only when I was turning back to the page and my gridview was visible (I'm using a multiview control, and the gridview I mentioned above is contained in its view).

By now, I restored the PageEventValidation and added at the update panel a postback trigger for the controls which are making visible my gridview.

Since I'm not receving the error message anymore... let's see I'l heard about it later...

Cheers

Is ASP.NET Ajax compatible with ClientScriptManager CallBack functions?

The current project usesClientScriptManager CallBack functions to implement a simple callback scenario. Is it OK to add ASP.NET Ajax and use the both ASP.NET Ajax and ClientScriptManager CallBack on the same page?In Ajax,we will use ScriptManager.RegisterClientScriptResource?to register client script.Try to take a look at this link for details -http://ajax.asp.net/docs/mref/M_System_Web_UI_ScriptManager_RegisterClientScriptResource_3_2a609ef4.aspx