Operation is Not Valid Due to the Current State of the Object

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Resolution

If ever you get an exception of ‘operation is not valid due to the current state of the object’ on a XMPro form, or any asp.net form with a huge number of controls, you need to set/add in the web.config file:

<appSettings>
<add key="aspnet:MaxHttpCollectionKeys" value="1001" />
</appSettings>

Increase the value until the problem goes away.

This is a security update from Microsoft link here.

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