Also i'd like to know if one of next expressions should return true: 1) typeof(int?).IsSubclassOf(typeof(Nullable<>)) 2) typeof(int?).IsSubclassOf(typeof(Nullable)) -- View this message in context: http://www.nabble.com/ChangeType+for+Nullable-t1675856.html#a4544655 Sent from the Mono - Dev forum at Nabble.com.