Validation annotations
We discussed using data annotations in Chapter 7 when we explored the Code First workflow. At that time I said these are just a special set of .NET attributes. What I didn’t say then was that some annotations also trigger validation.
Any annotation that descends from the ValidationAttribute class in the System.ComponentModel.DataAnnotations namespace will be included in the validation pipeline. There are eight in .NET 4.5, seven in .NET 4.0. (Compare is the new one.)
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