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BOOK: Professional ASP.NET MVC 2
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Old September 26th, 2010, 02:30 PM
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Default Handling Edit Errors (page 68)

I have got as far page 68 where the illustration shows that ommitting the Title is flagged as an error handled by the TryUpdateModel() helper method. However when I try leaving out the Title and attempt to Save, I get an exception occur in the NerdDinner Designer.cs class:

_Title = StructuralObject.SetValidValue(value, false);

which says that value cannot be null

Can anybody help please? Thanks
Old September 27th, 2010, 02:15 PM
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Default Are you debugging ?

i had a similiar effect but only when Debugging the application. When running the application i did not get such error anymore.

What is the class Designer.cs ?
Old September 27th, 2010, 06:14 PM
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Thanks, Yes I am debugging. The Designer class is the auto generated class created when the entity .edmx file is created.
Old October 11th, 2010, 04:33 PM
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It's an unhandled exception warning (not an error). Just press F5 to continue.

You if it really bothers you, you can turn off this feature completely or for a specific namespace. In VS2010, select "Debug", "Exceptions", expand "Common Language Runtime Exceptions", uncheck "User-unhandled" box for the System.Data item.

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