SQL-Server: Error - Exclusive access could not be obtained because the database is in use

Question

I am actually trying to make a script (in Sql Server 2008) to restore one database from one backup file. I made the following code and I am getting an error -

Answer 1

Use Master
alter database databasename set offline with rollback immediate;

--Do Actual Restore
RESTORE DATABASE databasename
FROM DISK = 'path of bak file'
WITH MOVE 'datafile_data' TO 'D:\newDATA\data.mdf',
MOVE 'logfile_Log' TO 'D:\newDATA\DATA_log.ldf',replace

alter database databasename set online with rollback immediate;
GO