Human-readable description of the CardType .
This property is filled after calling the ValidateCard method, and will contain a text description of the CardType. This is useful to distinguish different program cards. For instance, a CardType of ccDiners might have a corresponding CardTypeDescription of "Diner's Club International", "Diner's Club Carte Blanche", or "Diner's Club enRoute".
This property is read-only.