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copied!<p>You need to create a custom validation attribute - there's is plenty of help on the web. The following is an adaptation from a similar dependant attribute.</p> <pre><code>public class GreaterThanOtherAttribute : ValidationAttribute, IClientValidatable { public string DependentProperty { get; set; } public GreaterThanOtherAttribute (string dependentProperty) { this.DependentProperty = dependentProperty; } protected override ValidationResult IsValid(object value, ValidationContext validationContext) { // get a reference to the property this validation depends upon var containerType = validationContext.ObjectInstance.GetType(); var field = containerType.GetProperty(this.DependentProperty); if (field != null) { // get the value of the dependent property var dependentvalue = field.GetValue(validationContext.ObjectInstance, null); // compare the value against the target value if ((dependentvalue == null && this.TargetValue == null) || (dependentvalue != null && dependentvalue < this.TargetValue))) { // match => means we should try validating this field return new ValidationResult(this.ErrorMessage, new[] { validationContext.MemberName }); } } return ValidationResult.Success; } </code></pre> <p>and then decorate your model:</p> <pre><code>public class id { [Required] public decimal l_ID { get; set; } [Required] [GreaterThanOtherAttribute("l_ID")] public decimal v_ID { get; set; } } </code></pre> <p>What you now need to do is to find an example custom attribute and adapt it to use the above.</p> <p>HEALTH WARNING - this is not tested in any way and probably contains error.</p> <p>Good luck!</p>

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