CODEWITHSUNDEEP
c#asp.netupdatepanelsharepoint-2013
imSantoshKumar
imSantoshKumar

Reputation: 194

Invalid postback or callback argument. Event validation is enabled using in configuration or <%@ Page EnableEventvalidation =”true” %>

I am getting the below detailed error:

Invalid postback or callback argument. Event validation is enabled using in configuration or <%@ Page EnableEventvalidation =”true” %> in a page. For security purpose, this feature verifies that arguments to postback or callback events originate from the server that originally rendered them.

I am having a webpart page with a webpart where i do have a UPdatePanel and a button Upon Button click i am getting this error.

the same package(wsp) which we are using in one of our environment is working fine and the same is not working in another environment.

Help in this is highly appreciable.

Upvotes: 2

Views: 2358

Answers (3)

Parth Shah
Parth Shah

Reputation: 1

add EnableEventValidation="false" in page directive 

  <%@ Page EnableEventValidation="false" %>

Upvotes: 0

Greg
Greg

Reputation: 11480

Without code it will be incredibly difficult to diagnose your issue.

You mentioned that your utilizing an Update Panel, which in essence will automatically store your page in memory, then it will render the proper Ajax to hide the Postback. The Microsoft Developer Network (MSDN) basically warns you when you use the EnableEventValidation with Client-Side modification.

If you write client script that changes a control in the client at run time, you might have to use the RegisterForEventValidation method in order to avoid false event validation errors.

Also if you initialize out of your web.config and directly in code, you should ensure that you call the validation before the page has been initialized. So I would potentially use:

protected void Page_PreInit()
{
     // Before Page Initialization
}

Which would potentially eliminate any errors from the front-end, without code can't be of more assistance.

Upvotes: 2

Hugo Yates
Hugo Yates

Reputation: 2111

Ok without some code to go on I'll fire some rounds off into the dark, I know next to nothing about SharePoint so I maybe missing something obvious here:

Firstly, check your environments, one may have a different web.config which has EnableEventValidation set to false.

Secondly on Page_Load are you doing any DataBind? Depending on whatever your code is doing you may need make sure it's not binding on PostBack - or if it is already; try binding on PostBack.

Thirdly; any html or < > characters being included anywhere in the form? Also line breaks in data (my memory is a bit hazy on this one) I seem to remember, something like:

<option value="
my value
">select this</option>

Could cause it too. So doing a Trim() on data is recommended.

Lastly: Tag bleed out, check none of your tags are unclosed, something like <span <asp:TextBox [...] /> this could be the cause too.

Upvotes: 0

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