ModelState.AddModelError – How can I add an error that isn’t for a property?

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I eventually stumbled upon an example of the usage I was looking for – to assign an error to the Model in general, rather than one of it’s properties, as usual you call: 

ModelState.AddModelError(string key, string errorMessage);

but use an empty string for the key:

ModelState.AddModelError(string.Empty, "There is something wrong with Foo.");

The error message will present itself in the <%: Html.ValidationSummary() %> as you’d expect.

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