Invalid postback or callback argument

[Mike P]

I have added a couple of buttons to my ASP.NET 2.0 page. which both are
meant to do pretty simple things, a Back button and a Submit data
button. But I get this error whenever I click either of the buttons :

Invalid postback or callback argument. Event validation is enabled
using <pages enableEventVali dation="true"/> in configuration or <%@ Page
EnableEventVali dation="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
ClientScriptMan ager.RegisterFo rEventValidatio n method in order to
register the postback or callback data for validation.


How do I prevent this error?


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[clickon]

RE: Invalid postback or callback argument

This event usually happens when validation is enabled and you have either,
added fields to the form on the clientside and/or you have submitted the form
before the following hidden field has been rendered,

<input type="hidden" name="__EVENTVA LIDATION" id="__EVENTVALI DATION"
value="/wEWBALDgtmMCQLm wMTlCwLT/KSEAQKt7K6OC7Qm o2W+MsXlihjcAaI c/unn8Nw3" />.

Basicaly ASP.net is trying to make sure that the form being submitted is the
same form that it rendered.

"Mike P" wrote:
[color=blue]
> I have added a couple of buttons to my ASP.NET 2.0 page. which both are
> meant to do pretty simple things, a Back button and a Submit data
> button. But I get this error whenever I click either of the buttons :
>
> Invalid postback or callback argument. Event validation is enabled
> using <pages enableEventVali dation="true"/> in configuration or <%@ Page
> EnableEventVali dation="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
> ClientScriptMan ager.RegisterFo rEventValidatio n method in order to
> register the postback or callback data for validation.
>
>
> How do I prevent this error?
>
>
> *** Sent via Developersdex http://www.developersdex.com ***
>[/color]

[Mike P]

Re: Invalid postback or callback argument

Figured this out myself...a </form> tag that shouldn't have been there
was causing this error.



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