Invalid postback or callback argument.

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Visual studio 2008 (asp.net 1.1 to 2.0) appear error:

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.

stacktrace
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.ListBox.LoadPostData(String postDataKey, NameValueCollection postCollection)
at System.Web.UI.WebControls.ListBox.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)
I used EnableEventValidation="false" not appear error but not work and RegisterForEventValidation for all control but not work.

Posted 20-Dec-09 20:01pm

Hamid Reza As'adi

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Christian Graus · Answer 1 · 2009-12-20T20:17:00

Solution 1

wrote:
I used EnableEventValidation="false" not appear error but not work

What do you mean by 'not work' ? I've done that in the past and it's fixed the issue. Perhaps you fixed this error but your code is still broken ?

Posted 20-Dec-09 20:17pm

Christian Graus