public override int GetHashCode() { var hashCode = 1007649997; hashCode = hashCode * -1521134295 + DeliveryId.GetHashCode(); hashCode = hashCode * -1521134295 + EqualityComparer <string> .Default.GetHashCode(DeliveryDate); hashCode = hashCode * -1521134295 + DeliveryPrice.GetHashCode(); hashCode = hashCode * -1521134295 + EqualityComparer <string> .Default.GetHashCode(DeliveryAddress); hashCode = hashCode * -1521134295 + CardNumber.GetHashCode(); hashCode = hashCode * -1521134295 + EqualityComparer <string> .Default.GetHashCode(Description); return(hashCode); }