When the enumerator is created, it does not point to an object, so the KeyContainerPermissionAccessEntryEnumerator.Current property is not valid and will throw an exception if it is accessed. You must first call the KeyContainerPermissionAccessEntryEnumerator.MoveNext method to position the cursor at the first object in the collection.

Getting the KeyContainerPermissionAccessEntryEnumerator.Current property multiple times with no intervening calls to KeyContainerPermissionAccessEntryEnumerator.MoveNext will return the same System.Security.Permissions.KeyContainerPermissionAccessEntry object each time.