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copied!<p>You can't apply the same data annotation twice to one property.</p> <p>I don't know what your current <code>RequiredIfAttribute</code> code looks like, but I think you will have to write another custom validator that checks the selected country and adjusts the error message accordingly.</p> <pre><code>public class PostalCodeRequiredAttribute : ValidationAttribute { private const string errorMessage = "{0} is required."; public string CountryPropertyName { get; private set; } public PostalCodeRequiredAttribute(string countryPropertyName) : base(errorMessage) { CountryPropertyName = countryPropertyName; } public override string FormatErrorMessage(string name) { return string.Format(errorMessage, name); } protected override ValidationResult IsValid(object value, ValidationContext validationContext) { if (value != null) return ValidationResult.Success; var countryPropertyInfo = validationContext.ObjectType.GetProperty(CountryPropertyName); string country = countryPropertyInfo.GetValue(validationContext.ObjectInstance, null).ToString(); // assuming your country property is bound to a string string name; if (country == "United States") name = "Zip code"; else if (country == "Canada") name = "Postal code"; else return ValidationResult.Success; // assuming postal code not required for all other countries return new ValidationResult(FormatErrorMessage(name)); } } </code></pre> <p>You would annotate like this, assuming your country property is called <code>Country</code>:</p> <pre><code>[PostalCodeRequired("Country")] public string PostalCode { get; set; } </code></pre>

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