Adding Validation Attributes With an Entity Framework Data Model

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You can create a partial class, separate from the EF generated class, to store the metadata in. 

//Contact.cs - The original auto-generated file 
[System.ComponentModel.DataAnnotations.MetadataType(typeof(ContactMetadata))]
public partial class Contact
{
    public int ContactID { get; set; }
    public string ContactName { get; set; }
    public string ContactCell { get; set; }
}

//ContactMetadata.cs - New, seperate class

using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
internal sealed class ContactMetadata
{
    [Required(ErrorMessage = "Name is required.")]
    [StringLength(5)]  
    public string ContactName;
}

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