How to add data annotation for entities automatically created by Data-First?

Question

If model-first, we use [MetadataType(typeof(ConceptMetadataSource))] to attach a MetadataSource file which contains all the data annotations like [Hidden

Answer 1

define a view model like

public class VMConcept
{ 
    public Concept NewConcept {get; set;}
}

[MetadataType(typeof(ConceptMetadataSource))]
public partial class Concept{}

public class ConceptMetadataSource {

 [Required(ErrorMesssage="This Field is required")]
 public string PropertyName {get; set;}
}