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| | | Supreme Being
Group: Forum Members
Last Login: Tuesday, June 02, 2009
Posts: 55, Visits: 53 |
| | When ever modifying the WebPart getting the below error. Server Error in '/' Application.
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. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.ArgumentException: 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.
Source Error: An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. |
Stack Trace:
[ArgumentException: 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.UI.ClientScriptManager.ValidateEvent(String uniqueId, String argument) +173 System.Web.UI.Control.ValidateEvent(String uniqueID, String eventArgument) +72 System.Web.UI.WebControls.DropDownList.LoadPostData(String postDataKey, NameValueCollection postCollection) +53 System.Web.UI.WebControls.DropDownList.System.Web.UI.IPostBackDataHandler.LoadPostData(String postDataKey, NameValueCollection postCollection) +13 System.Web.UI.Page.ProcessPostData(NameValueCollection postData, Boolean fBeforeLoad) +346 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1743 |
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| | | Supreme Being
Group: Forum Members
Last Login: Thursday, January 27, 2011
Posts: 29, Visits: 46 |
| Issueage crash with the Postback error while modifying the workitem list webpart (click on right corner of the webpart - modify shared page - display properties – select any property - check - click OK).
CAUSE:This issue is because some how the event validation got enabled for the web application. This could be either because the designer tools added the same in the default.aspx when edited or .NET 2.0 Security Update is applied on the SharePoint system. If the event validation is enabled, the same checks the incoming values in a POST to ensure the values are known, good values and if the runtime sees a value it doesn’t know about, it throws an exception. We are using Ajax in our controls and dynamically adding data to our controls. Ajax actually uses JavaScript http request which actually does not reload the whole page where as Event validation validates the view state of the page. Since they both differ, runtime throws the exception.
RESOLUTION:Add "enableEventValidation=false" for pages tag in the web.config file of that particular SharePoint application to resolve the issue.
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