Or you can simply use ApexSQL Edit, which has some very spiffy built-in source code control functionalilty - among many other features.
Disclaimer: I have a close relationship with Apex, use their products and recommend them to my clients. Also, if you care to you can mention TheSQLGuru sent you you will get a discount and my daughter will get a few coins for her college fund.
Best,
Kevin G. Boles
SQL Server Consultant
SQL MVP 2007-2012
TheSQLGuru on googles mail service