Hi! I´m checking if a property is null in a PropertyCriteriaControl but it ain´t working. I have read the forum and I think this should work..? This is a date property, is IsNull just working on string properties? How can I solve this? PropertyCriteria onGoing = new PropertyCriteria(); onGoing.Condition = CompareCondition.Equal; onGoing.IsNull = true; onGoing.Name = "ProjectStop"; criteriaCollection.Add(onGoing); Regards /Helena