Databases
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PO
 

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  1. PO
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    <p>Well it depends. Invalid viewstate can happen for a variety of reasons.</p> <ol> <li>Viewstate is too big and has not finished rendering before a user causes a postback on the page. The fix is generally to disable all controls that trigger postbacks and enable them client side once the page has finished loading - see <a href="http://blogs.msdn.com/tom/archive/2008/03/14/validation-of-viewstate-mac-failed-error.aspx" rel="noreferrer">http://blogs.msdn.com/tom/archive/2008/03/14/validation-of-viewstate-mac-failed-error.aspx</a></li> <li>You are using viewstate MACs (and you should be, for security reasons) but you have not set a machine key and the application pool has recycled generating a new one. Don't forget to set a ViewStateUserKey.</li> <li>Someone is using an old version of IE on the mac where it truncates hidden form fields. In this case you'll need to move viewstate out of the page into <a href="http://msdn.microsoft.com/en-gb/magazine/cc163577.aspx#S4" rel="noreferrer">session state</a>.</li> <li>Viewstate MAC issues generally indicate you're on a web farm and have forgotten to set a machine key in web.config. However if you have done this then it is probably someone trying to do bad things (bots posting comments, someone trying to trigger events for disabled controls etc.) The cause of these should be tracked down if only to rule out potential security issues.</li> </ol> <p>Whatever you do <strong><em>do not</em></strong> turn off viewstate or event validation.</p>
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    1. POShould I ignore the occasional Invalid viewstate error?
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    1. USblowdart
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    1. POShould I ignore the occasional Invalid viewstate error?
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    1. COCan you give more detail about item 2?
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      1. USMike Cole
    2. COWell viewstate contains a signature to guard against someone editing it on the client side. That signature is generated from the machine key for the server. Unless you set a machine key specifically it gets regenerated when the application pool restarts, causing all previous viewstates to become invalid. If you have user authentication you should also set a ViewStateUserKey to guard against CSRF.
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      1. USblowdart
 

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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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