Validate Date based on another property

Topics: Validation Application Block
Dec 23, 2009 at 7:28 AM


I have 2 date columns, purchase date and warranty expiry date.

I should include a condition such that warranty expiry date is atleast 6 months later than purchase date.

How should I define this rule.


Dec 23, 2009 at 9:21 AM


I see two ways of doing that. One is to implement a SelfValidation which you will add your custom logic of comparing the values. Please see this: . The other one is to use the PropertyComparisonValidator, As shown below, I have another extra property which returns the purchase date plus 6 months where the warranty expirydate will be checked if its greater than that property.

public class ClassToValidate
        private DateTime purchaseDate;

        public DateTime PurchaseDate
            get { return purchaseDate; }
            set { purchaseDate = value; }

        private DateTime warrantyExpiryDate;
        [PropertyComparisonValidator("CompareDate", ComparisonOperator.GreaterThan,
            MessageTemplate="Must be at least six (6) months greater than the purchase date.")]
        public DateTime WarrantyExpiryDate
            get { return warrantyExpiryDate; }
            set { warrantyExpiryDate = value; }

        public DateTime CompareDate
                return purchaseDate.AddMonths(6);


Valiant Dudan
Global Technology and Solutions
Avanade, Inc.

Dec 28, 2009 at 9:52 AM


That one worked.