Duncan,

>I have built a User Control that contains an MM Business Object and a grid to present the BO's data. When I go to place this UC on a form, I get the following error:
>
>"Code generation for property 'State' failed. Error was: 'The value '0' is not a valid value for the enum 'mmBusinessSate'."
>
>Anytime I change anything on the form, the error occurs and recurs each time I save or rebuild until I close and reload the Solution.
>
>When I look in the Form's designer code, it has rendered/created the Business object in the form itself, which shouldn't be the case since the Business object is handled in the User Control.
>
>I suspect this has something to do with Serialization and it may not be specific to MM, but any thoughts/feedback/workarounds for this issue would be much appreciated. Thanks very much...

I recommend checking out the code in the constructor of your user control (and in your properties for that matter) and make sure there isn't any code that is dependent on a runtime object. Visual Studio "runs" the constructor of your components at design time. Check out the MM .NET Dev guide topic "Why do I get errors when I open a component in design mode" for details.

Best Regards,