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copied!<p>I solved it. It would appear that the <a href="http://www.codeproject.com/KB/validation/Data_Annotations_with_ASP.aspx?msg=3603632&display=Mobile" rel="nofollow">server control I found </a> was not designed to read fields in a buddy class via the MetadataType attribute. I modified the code to look for its validation attributes in the buddy class rather than the entity class itself.</p> <p>Here is the modified version of the linked server control:</p> <pre><code> [DefaultProperty("Text")] [ToolboxData("<{0}:DataAnnotationValidator runat=server></{0}:DataAnnotationValidator>")] public class DataAnnotationValidator : BaseValidator { #region Properties /// <summary> /// The type of the source to check /// </summary> public string SourceTypeName { get; set; } /// <summary> /// The property that is annotated /// </summary> public string PropertyName { get; set; } #endregion #region Methods protected override bool EvaluateIsValid() { // get the type that we are going to validate Type source = GetValidatedType(); // get the property to validate FieldInfo property = GetValidatedProperty(source); // get the control validation value string value = GetControlValidationValue(ControlToValidate); foreach (var attribute in property.GetCustomAttributes( typeof(ValidationAttribute), true) .OfType<ValidationAttribute>()) { if (!attribute.IsValid(value)) { ErrorMessage = attribute.ErrorMessage; return false; } } return true; } private Type GetValidatedType() { if (string.IsNullOrEmpty(SourceTypeName)) { throw new InvalidOperationException( "Null SourceTypeName can't be validated"); } Type validatedType = Type.GetType(SourceTypeName); if (validatedType == null) { throw new InvalidOperationException( string.Format("{0}:{1}", "Invalid SourceTypeName", SourceTypeName)); } IEnumerable<MetadataTypeAttribute> mt = validatedType.GetCustomAttributes(typeof(MetadataTypeAttribute), false).OfType<MetadataTypeAttribute>(); if (mt.Count() > 0) { validatedType = mt.First().MetadataClassType; } return validatedType; } private FieldInfo GetValidatedProperty(Type source) { FieldInfo field = source.GetField(PropertyName); if (field == null) { throw new InvalidOperationException( string.Format("{0}:{1}", "Validated Property Does Not Exists", PropertyName)); } return field; } #endregion } </code></pre> <p>This code <em>only</em> looks in the buddy class. If you want it to check an actual class and then its buddy class, you'll have to modify it accordingly. I did not bother doing that because usually if you are using a buddy class for validation attributes it's because you are not able to use the attributes in the main entity class (e.g. Entity Framework).</p>

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