Comments on Asp.Net Ajax Tutorials: Invalid postback or callback argument solution. Ev...

Another useless post that doesn't solve anythi...

2012-02-16T17:36:46.621+05:30

Another useless post that doesn't solve anything

thanks a lot..this problem was driving me crazy!

2012-01-16T08:20:15.771+05:30

thanks a lot..this problem was driving me crazy!

Thank you very much

2011-12-01T15:19:58.248+05:30

Thank you very much

thank you very much.

2011-11-20T15:28:04.094+05:30

thank you very much.

Thanks for sharing the information. I am having th...

2011-09-02T23:48:35.021+05:30

Thanks for sharing the information.
I am having the same problem.
I have a dropdownlist with a ControlAdapter attached to it (for optgroup). AutoPostback is set to true. And on postback it is giving error.

I am not able to solve it.

Although by setting EnableEventValidation="false" for the Page directive, it is working. But there could be some other way.

Please help..

Hello, thanks for this great informations. In my c...

2010-09-03T23:42:28.982+05:30

Hello,
thanks for this great informations. In my case the problem was due to the fact that I forgot to fill the DataTextField and the DataValueField in a DropDownList.

Regards
Vincenzo

Please help Invalid postback or callback argument...

2010-07-30T01:15:51.281+05:30

Please help

Invalid postback or callback argument. Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ 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.

System.Web

at System.Web.UI.ClientScriptManager.ValidateEvent(String uniqueId, String argument)
at System.Web.UI.Control.ValidateEvent(String uniqueID, String eventArgument)
at System.Web.UI.WebControls.ImageButton.RaisePostBackEvent(String eventArgument)
at System.Web.UI.WebControls.ImageButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument)
at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument)
at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData)
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

Your #1 solution worked for me, this issue had bee...

2010-02-15T01:04:38.208+05:30

Your #1 solution worked for me, this issue had been plauging me for months!

thank you verry much, i tried to override the rend...

2009-11-13T15:54:39.443+05:30

thank you verry much, i tried to override the render-method and use RegisterForEventValidation but only your solution was helpful

Yes you are correct, I am using JS to update the o...

2009-10-24T01:17:07.922+05:30

Yes you are correct, I am using JS to update the options available in two dropdowns based on the first dropdown's selection... So, cascading dropdowns without having to do a postback to get the new options.

Indeed I do have EnableViewState set to false for the three dropdowns.

It is baffling me because my user control works properly without the invalid postback error until I attempt to use the control within a gridview row...

Danny.. It seems that you ara changing the values...

2009-10-23T23:21:25.943+05:30

Danny..

It seems that you ara changing the values of Dropdowns with JS, correct?

If so then you can check with EnableViewState="false" for that(those) dropdowns.

Basically when you reload the page it binds all the drop downs with values from viewstate.

Please check it. and let us know

Hello, I am encountering this invalid postback iss...

2009-10-23T19:03:13.076+05:30

Hello, I am encountering this invalid postback issue that I've not been able to resolve fully.

I have created a user control, that is essentially consists of an asp:linkbutton that acts as a banner of sorts, a modal popup, and some databound asp:dropdownslists (as well as an "OK" linkbutton and a "cancel" linkbutton).

When a user clicks on the "banner" linkbutton, I use JavaScript to show the modal popup and set the selected values in the dropdown lists based upon the state when the user control was loaded on a page.

The first dropdown selected value is used to determine what options are available for selection in the remaning two dropdowns. So, if the user changes the selection of the first dropdown, I have some JS to manipulate the available options in the other dropdowns.

Once the user has chosen the desired selections from the dropdowns and clicks the "OK" linkbutton, I execute some JS to process the selections, hide the modal popup, and then call __doPostBack() with the ClientID of my "OK" linkbutton as the EVENTTARGET, and a given string as the EVENTARGUMENT that I then capture in the Page_Load method of the user control to specify what kind of processing to do on the user's selections in the code behind (C#).

It was then that I started to get a .NET error:

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.

at System.Web.UI.ClientScriptManager.ValidateEvent(String uniqueId, String argument) at System.Web.UI.Control.ValidateEvent(String uniqueID, String eventArgument) at System.Web.UI.WebControls.DropDownList.LoadPostData(String postDataKey, NameValueCollection postCollection) at System.Web.UI.WebControls.DropDownList.System.Web.UI.IPostBackDataHandler.LoadPostData(String postDataKey, NameValueCollection postCollection) at System.Web.UI.Page.ProcessPostData(NameValueCollection postData, Boolean fBeforeLoad) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

After some searching, I found a *potential* solution based upon overriding the user control's Render() method. In the Render() method, I have some C# code to do this:

Page.ClientScript.RegisterForEventValidation(< dropdownlist >.UniqueID, < string matching the EVENTARGUMENT specified in the __doPostBack call >);

I have one statement like this for each of the my dropdowns, and I also even have a function call to loop through each of the ListItems in the dropdowns and call RegisterForEventValidation(), using the dropdown's UniqueID and the given ListItem's value as parameters.

Now, I have some success doing this, if my user control is simply on a Page or is contained in another basic user control. However, if my user control is being rendered in rows of gridview, I still get the Invalid postback or callback argument...

Any help would be greatly appreciated.

Good day, Thank you for post. But look like that ...

2009-06-03T13:04:12.133+05:30

Good day,

Thank you for post. But look like that error can appear in other way too. I have 2 projects. In both of them time to time appear this error. But projects absolute different in databinding work part.
1. In first peoject I was disable ViewState for Repeater and DataBind it on each page request from Session.
2. Repeater boubnd one time on !Page.IsPostBack

As I say, both of them time to time got such error in log.

Is it present way to find what controll or code part raise this error.

P.S. 2) Invalid Postback or Callback argument while submitting form - it's not true, in this way system raise HttpRequestValidationException: Exception message: A potentially dangerous Request.Form value ...

Thank you very much boss. I used If(!IsPostBack) ...

2009-06-01T21:58:03.270+05:30

Thank you very much boss.
I used
If(!IsPostBack)
{
}
in page_load sections and put my req. code there. now its working. thanks a lots.

Just add this to your web config and make pages..l...

2009-05-26T16:06:19.945+05:30

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

customErrors defaultRedirect="ErrorPage.aspx" mode="On"
error statusCode="500" redirect="servererror.aspx" error statusCode="404" redirect="filenotfound.aspx" error statusCode="403" redirect="AccessDenied.aspx" customErrors
system.web include html tags Please

Thank for the vital information on Invalid Postbac...

2009-02-27T14:27:00.000+05:30

Thank for the vital information on Invalid Postback or Callback argument in asp.net. It was very helpful.

Thank you for this post! I had some problems with ...

2009-02-25T14:06:00.000+05:30

Thank you for this post! I had some problems with this specific error and didn't know where to look to solve this issue. After reading this post I solved the problem!

Re: Invalid Postback or Callback Argument

H...

2008-12-10T23:22:00.000+05:30

Re: Invalid Postback or Callback Argument

Hi Kapil,

If you can post stack trace of your Invalid Postback or Callback argument then I can help you to solve Invalid Postback or callback argument

Also check what is the eventargument in the postback or callback.

i am sending Session Variable for back and forth t...

2008-12-10T17:29:00.000+05:30

i am sending Session Variable for back and forth the data for displaying gridview with same data, then i have this problem which is not remove by pages validateRequest="false" enableEventValidation="false"

Plz help me.

kapil gupta

Thanks for Providing the Vital Information that ca...

2008-04-04T03:15:00.000+05:30

Thanks for Providing the Vital Information that can easily sort out the issue.

Thanks a million for your insight into this issue....

2008-03-12T04:09:00.000+05:30

Thanks a million for your insight into this issue.

E bhaila o tamaro khub khub aabhar......

2008-03-11T11:29:00.000+05:30

E bhaila o tamaro khub khub aabhar......

I have the same error,it is solved using these sol...

2008-02-13T19:33:00.002+05:30

I have the same error,it is solved using these solutions.
Thanks...........
Ramesh Ahir

I have the same error,it is solved using these sol...

2008-02-13T19:33:00.001+05:30

I have the same error,it is solved using these solutions.
Thanks...........
Ramesh Ahir

I have the same error,it is solved using these sol...

2008-02-13T19:33:00.000+05:30

I have the same error,it is solved using these solutions.
Thanks...........
Ramesh Air

Comments on Asp.Net Ajax Tutorials: Invalid postback or callback argument solution. Ev...

Another useless post that doesn't solve anythi...

thanks a lot..this problem was driving me crazy!

Thank you very much

thank you very much.

Thanks for sharing the information. I am having th...

Hello, thanks for this great informations. In my c...

Please help Invalid postback or callback argument...

Your #1 solution worked for me, this issue had bee...

thank you verry much, i tried to override the rend...

Yes you are correct, I am using JS to update the o...

Danny.. It seems that you ara changing the values...

Hello, I am encountering this invalid postback iss...

Good day, Thank you for post. But look like that ...

Thank you very much boss. I used If(!IsPostBack) ...

Just add this to your web config and make pages..l...

Thank for the vital information on Invalid Postbac...

Thank you for this post! I had some problems with ...

Re: Invalid Postback or Callback ArgumentH...

i am sending Session Variable for back and forth t...

Thanks for Providing the Vital Information that ca...

Thanks a million for your insight into this issue....

E bhaila o tamaro khub khub aabhar......

I have the same error,it is solved using these sol...

I have the same error,it is solved using these sol...

I have the same error,it is solved using these sol...

Re: Invalid Postback or Callback Argument

H...