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    <p>Validatable Objects and MetadataType attributes are used in the partial classes by frameworks such as MVC, for example.</p> <p><strong>Here's an example of using the MetadataType attribute:</strong></p> <pre><code>[MetadataType(typeof(UserMetadata))] public partial class User { private class UserMetadata { [DisplayName("User Id")] public long UserId { get; set; } [DisplayName("User Name")] public string UserName { get; set; } } } </code></pre> <p>When you use the MVC framework, any model that has these attributes will be read for purposes of automatic generation of label fields for the corresponding displays/editors.</p> <p><strong>Example of using IValidatableObject</strong></p> <pre><code>public partial class Apple : IValidatableObject // Assume the Apple class has an IList&lt;Color&gt; property called AvailableColors { public IEnumerable&lt;ValidationResult&gt; Validate(ValidationContext validationContext) { foreach (var color in this.AvailableColors) { if (color.Name == "Blue") // No blue apples, ever! { yield return new ValidationResult("You cannot have blue apples."); } } } } </code></pre> <p>MVC will pick up on this IValidatableObject and ensure that any Apple that comes its way through it's validation step will never come in blue.</p> <p><strong>EDIT</strong></p> <p>As an example of your date range concern using IValidatableObject:</p> <pre><code>public partial class ObjectWithAStartAndEndDate : IValidatableObject { public IEnumerable&lt;ValidationResult&gt; Validate(ValidationContext validationContext) { if (this.StartDate &gt;= this.EndDate) { yield return new ValidationResult("Start and End dates cannot overlap."); } } } </code></pre>
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    1. POWhat uses should I make of Entity Framework Entity Partial Classes?
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    1. USdoctorless
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    1. COSo mainly ensuring the entity is a valid thing?
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      1. USGraemeMiller
    2. COAny type of business logic, really. If you have one property that is required when another property of a different type is set and not required otherwise, you can do this by implementing the 'ghost methods' in a partial class.
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      1. USJim Schubert
    3. COI guess I'm using AutoMapper to make ViewModels and thet have the display name. However I suppose I need to enforce required etc on both the ViewModel and the Entity.
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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