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From: Andre Grumbach on 25 Aug 2010 04:36
Hallo NG,
I've got a Problem on an ASP.Net Page.

This page shows some data in a tree view and in a drop down list.
There are also two image buttons (expand all and refresh)

If some user clicks permanently on the button expand all, there will be
sometime a problem with the ASP Page.


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) +159
System.Web.UI.Control.ValidateEvent(String uniqueID, String
eventArgument) +108
System.Web.UI.WebControls.DropDownList.LoadPostData(String postDataKey,
NameValueCollection postCollection) +55
System.Web.UI.WebControls.DropDownList.System.Web.UI.IPostBackDataHandler.LoadPostData(String
postDataKey, NameValueCollection postCollection) +11
System.Web.UI.Page.ProcessPostData(NameValueCollection postData, Boolean
fBeforeLoad) +353
System.Web.UI.Page.ProcessRequestMain(Boolean
includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1194

The Page Load Event from the page is also using a try/catch expression, but
there

There is NO custom event for the postback like (__doPostBack('MyEvent',
'MyEventArg')).

So is there any solution for this problem or can somebody tells me a
possibility whats the invalide postback or callback argument (name and
values)?

Thanks,
Andre



From: Andre Grumbach on 25 Aug 2010 04:39
Hi again,
the solution EnableEventValidation="false" is not a possibility in this
page.




"Andre Grumbach" <andre.grumbach(a)nospam.de> schrieb im Newsbeitrag
news:O41$ICDRLHA.2100(a)TK2MSFTNGP04.phx.gbl...
> Hallo NG,
> I've got a Problem on an ASP.Net Page.
>
> This page shows some data in a tree view and in a drop down list.
> There are also two image buttons (expand all and refresh)
>
> If some user clicks permanently on the button expand all, there will be
> sometime a problem with the ASP Page.
>
>
> 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) +159
> System.Web.UI.Control.ValidateEvent(String uniqueID, String
> eventArgument) +108
> System.Web.UI.WebControls.DropDownList.LoadPostData(String postDataKey,
> NameValueCollection postCollection) +55
>
> System.Web.UI.WebControls.DropDownList.System.Web.UI.IPostBackDataHandler.LoadPostData(String
> postDataKey, NameValueCollection postCollection) +11
> System.Web.UI.Page.ProcessPostData(NameValueCollection postData, Boolean
> fBeforeLoad) +353
> System.Web.UI.Page.ProcessRequestMain(Boolean
> includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1194
>
> The Page Load Event from the page is also using a try/catch expression,
> but there
>
> There is NO custom event for the postback like (__doPostBack('MyEvent',
> 'MyEventArg')).
>
> So is there any solution for this problem or can somebody tells me a
> possibility whats the invalide postback or callback argument (name and
> values)?
>
> Thanks,
> Andre
>
>
>

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