Remove Duplicate MobileMe Calendar and Events on iPad

After upgraded to iOS 4.2, my iPad got the issue: the new MobileMe Calendar had duplicate calendars and events.How to remove duplicate calendar* On the iPad's home screen, tap Settings > Mail, Contacts, Calendars.* Choose your MobileMe account and make sure the Calendar slider is enabled.* Tap the manually-created CalDAV account (cal.me.com) and delete the account.