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copied!<p><strong>EDIT:</strong> I found the answer here: <a href="http://forums.silverlight.net/forums/p/149264/377212.aspx" rel="nofollow noreferrer">http://forums.silverlight.net/forums/p/149264/377212.aspx</a></p> <p>Before validating, you need to manually register the metadata class:</p> <pre><code>TypeDescriptor.AddProviderTransparent( new AssociatedMetadataTypeTypeDescriptionProvider(typeof(Person), typeof(PersonMetadata)), typeof(Person)); List<ValidationResult> res = new List<ValidationResult>(); bool valid = Validator.TryValidateObject(p, new ValidationContext(p, null, null), res, true); </code></pre> <p><em>(Original answer follows)</em></p> <p>The problem isn't specifically with your partial class, it's that Validator.TryValidateObject doesn't seem to recognize the MetaDataType attribute. I have the same problem - the built-in validation in MVC 2 recognizes the metadata class, but TryValidateObject doesn't.</p> <p>See these: <a href="https://stackoverflow.com/questions/2050161/validating-dataannotations-with-validator-class">Validating DataAnnotations with Validator class</a> <a href="https://stackoverflow.com/questions/2422031/validation-does-not-work-when-i-use-validator-tryvalidateobject">Validation does not work when I use Validator.TryValidateObject</a></p> <p>As a side note, I don't know if it's necessary, but all examples I've seen for metadata classes employ the default get/set on each property:</p> <pre><code>[Required(AllowEmptyStrings=false, ErrorMessage="Name required entry")] [StringLength(3)] public string Name { get; set; } </code></pre>

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