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    <p>I seem to recall that this error can occur if you click a button/link etc before the page has fully loaded.</p> <p>If this is the case, the error is caused by an ASP.net 2.0 feature called Event Validation. This is a security feature that ensures that postback actions only come from events allowed and created by the server to help prevent spoofed postbacks. This feature is implemented by having controls register valid events when they render (as in, during their actual Render() methods). The end result is that at the bottom of your rendered form tag, you'll see something like this:</p> <pre><code>&lt;input type="hidden" name="__EVENTVALIDATION" id="__EVENTVALIDATION" value="AEBnx7v.........tS" /&gt; </code></pre> <p>When a postback occurs, ASP.net uses the values stored in this hidden field to ensure that the button you clicked invokes a valid event. If it's not valid, you get the exception that you've been seeing.</p> <p>The problem you're seeing happens specifically when you postback before the EventValidation field has been rendered. If EventValidation is enabled (which it is, by default), but ASP.net doesn't see the hidden field when you postback, you also get the exception. If you submit a form before it has been entirely rendered, then chances are the EventValidation field has not yet been rendered, and thus ASP.net cannot validate your click.</p> <p>One work around is of course to just disable event validation, but you have to be aware of the security implications. Alternatively, just never post back before the form has finished rendering. Of course, that's hard to tell your users, but perhaps you could disable the UI until the form has rendered?</p> <p>from <a href="http://forums.asp.net/p/955145/1173230.aspx" rel="noreferrer">http://forums.asp.net/p/955145/1173230.aspx</a></p>
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    1. POStrange unhandled exception from asp.net application - Validation of viewstate MAC failed
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    1. USChris Driver
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    1. COSo if I just disable all the controls before until the render event completely finishes then this should solve it right?
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    2. COYes, that would work, but more specifically disable controls that cause a postback.
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    3. COThanks for the help Chris.
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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