Restore backup in SQL 2008R2

I have made SQL database backup before updating server to Server 2012
After upgrade,I have attempted to restore database using SQL Server Management Studio  and received error message Restore failed for the server localhost\MSDPM2012
Exclusive access could not be obtained because the database is in use
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PadawanDBAOperational DBACommented:
There are probably some open connections on the database.  There are two options: you can check the sys.dm_exec_sessions view for all sessions against your database (and manually kill them by spid) or there should be an option in the restore database diaglog options to close existing connections to destination database, which will automatically kill those sessions before the restore.

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Microsoft SQL Server 2008

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