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    <p>Simon Ince's blog post seems to be outdated.</p> <p>There is no need to use DataAnnotationsModelValidator or do a DataAnnotationsModelValidator registration.</p> <p>You can use the following code:</p> <pre><code>[AttributeUsage(AttributeTargets.Property, AllowMultiple=false)] public class RequiredIfAttribute : ValidationAttribute, IClientValidatable { private const string _defaultErrorMessage = "'{0}' is required when {1} equals {2}."; public string DependentProperty { get; set; } public object TargetValue { get; set; } public RequiredIfAttribute(string dependentProperty, object targetValue):base(_defaultErrorMessage) { this.DependentProperty = dependentProperty; this.TargetValue = targetValue; } public override string FormatErrorMessage(string name) { return String.Format(CultureInfo.CurrentCulture, ErrorMessageString, name, DependentProperty, TargetValue); } protected override ValidationResult IsValid(object value, ValidationContext context) { if (context.ObjectInstance != null) { Type type = context.ObjectInstance.GetType(); PropertyInfo info = type.GetProperty(DependentProperty); object dependentValue; if (info != null) { dependentValue = info.GetValue(context.ObjectInstance, null); if (object.Equals(dependentValue, TargetValue)) { if (string.IsNullOrWhiteSpace(Convert.ToString(value))) { return new ValidationResult(ErrorMessage); } } } } return ValidationResult.Success; } public IEnumerable&lt;ModelClientValidationRule&gt; GetClientValidationRules(ModelMetadata metadata, ControllerContext context) { ModelClientValidationRule rule = new ModelClientValidationRule(); rule.ErrorMessage = this.FormatErrorMessage(metadata.PropertyName); rule.ValidationType = "requiredif"; rule.ValidationParameters.Add("depedentproperty", DependentProperty); rule.ValidationParameters.Add("targetvalue", TargetValue); yield return rule; } } </code></pre> <p>and the javascript side: if you are using jquery:</p> <pre><code> $.validator.unobtrusive.adapters.add('requiredif', ['depedentproperty', 'targetvalue'], function (options) { options.rules["required"] = function (element) { return $('#' + options.params.depedentproperty).val() == options.params.targetvalue }; if (options.message) { options.messages["required"] = options.message; } $('#' + options.params.depedentproperty).blur(function () { $('#' + options.element.name).valid(); }); }); </code></pre>
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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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