Slowly Changing Dimension - MERGE

My source table looks like below: The records Code can change more than once is indicated within one day

BusinessKey Code CreatedDate

100              ABC  2012-02-25 08:36:38

100              DEF  2012-02-25 08:40:21

100              GIJ  2012-02-25 08:43:21

We need to keep a track of the Code as it changes and our final table should look like:

SurrogateKey BusinessKey Code StartDate                          EndDate

1                   100              ABC  2012-02-25 08:36:38      2012-02-25 08:40:21

2                   100              DEF  2012-02-25 08:40:21      2012-02-25 08:43:21

3                   100              GIJ  2012-02-25 08:43:21       2100-12-31 00:00:00

I need to load this in SQL Server 2008 R2 using a merge statement