[Task] Use the lightweight database, SQL Server Express LocalDB, during the development process. Visual Studio 2012 Visual Studio Express 2012 for Web [Description] 
SQL Server Express LocalDB is a lightweight database that’s for developers and that requires no administration or management of instances of SQL Server. Visual Studio 2012 installs LocalDB on the local machine by default. The storage emulator can now be initialized and backed by LocalDB. You can use LocalDB when you run and debug your application locally. For more information, see How to: Upgrade to SQL Server Express LocalDB and SQL Server 2012 Express LocalDB.