How to edit a contact from Address book in iphone?

I create one new application.i add the contact from address book see the code below but how to edit this add contact from address book i don't know . can any one have know then give the sample code or idea. thanx in advance give your valuable time for me. ``` //code for add contact in contact list ABRecordRef aRecord = ABPersonCreate(); CFErrorRef anError = NULL; ABRecordSetValue(aRecord, kABPersonFirstNameProperty, txtfirstname.text, &anError); ABRecordSetValue(aRecord, kABPersonLastNameProperty, txtlastName.text, &anError); ABRecordSetValue(aRecord, kABPersonBirthdayProperty, [datepick date], &anError); ABRecordSetValue(aRecord, kABPersonPhoneProperty, txtMobileNo, &anError); ABRecordSetValue(aRecord, kABPersonEmailProperty, txtEmailID, &anError); if (anError != NULL) { NSLog(@"error while creating.."); } CFStringRef firstName, lastName,birthDay; firstName = ABRecordCopyValue(aRecord, kABPersonFirstNameProperty); lastName = ABRecordCopyValue(aRecord, kABPersonLastNameProperty); birthDay = ABRecordCopyValue(aRecord, kABPersonBirthdayProperty); ABMutableMultiValueRef email = ABMultiValueCreateMutable(kABMultiStringPropertyType); ABMultiValueAddValueAndLabel(email, txtEmailID.text, CFSTR("email"), NULL); ABRecordSetValue(aRecord, kABPersonEmailProperty, email, &anError); CFRelease(email); ABMutableMultiValueRef multiPhone = ABMultiValueCreateMutable(kABMultiStringPropertyType); ABMultiValueAddValueAndLabel(multiPhone,txtMobileNo.text, kABPersonPhoneMainLabel, NULL); ABRecordSetValue(aRecord, kABPersonPhoneProperty, multiPhone,nil); CFRelease(multiPhone); UIImage *personImage; personImage = tempimage; NSData *dataRef = UIImagePNGRepresentation(personImage); CFDataRef dr = CFDataCreate(NULL, [dataRef bytes], [dataRef length]); CFErrorRef error = NULL; ABPersonSetImageData(aRecord, dr, &error); ABAddressBookRef addressBook; addressBook = ABAddressBookCreate(); BOOL isAdded = ABAddressBookAddRecord (addressBook,aRecord,&error); if(isAdded) { NSLog(@"added.."); } if (error != NULL) { NSLog(@"ABAddressBookAddRecord %@", error); } error = NULL; BOOL isSaved = ABAddressBookSave (addressBook,&error); if(isSaved) { UIAlertView* alertView = [[UIAlertView alloc] initWithTitle:@"Contact Save" message:nil delegate:self cancelButtonTitle:@"Dismiss" otherButtonTitles:nil]; [alertView show]; [alertView release]; NSLog(@"saved.."); } if (error != NULL) { NSLog(@"ABAddressBookSave %@", error); } CFRelease(aRecord); CFRelease(firstName); CFRelease(lastName); CFRelease(birthDay); CFRelease(addressBook); ```