backup and restore SQL

TITLE: Microsoft SQL Server Management Studio
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Restore failed for Server 'sacsql204'. (Microsoft.SqlServer.SmoExtended)

For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&ProdVer=12.0.2000.8+((SQL14_RTM).140220-1752)&EvtSrc=Microsoft.SqlServer.Management.Smo.ExceptionTemplates.FailedOperationExceptionText&EvtID=Restore+Server&LinkId=20476
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ADDITIONAL INFORMATION:

An exception occurred while executing a Transact-SQL statement or batch. (Microsoft.SqlServer.ConnectionInfo)

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Exclusive access could not be obtained because the database is in use.
RESTORE DATABASE is terminating abnormally. (Microsoft SQL Server, Error: 3101)

For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft%20SQL%20Server&ProdVer=12.00.2480&EvtSrc=MSSQLServer&EvtID=3101&LinkId=20476
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BUTTONS:

OK
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解决方案：

disconnect other users by scripts belowe:

USE master

GO

ALTER DATABASE YourDatabaseName SET SINGLE_USER WITH ROLLBACK IMMEDIATE

GO

ALTER DATABASE YourDatabaseName SET OFFLINE WITH ROLLBACK IMMEDIATE

GO

ALTER DATABASE YourDatabaseName SET MULTI_USER

GO

ALTER DATABASE YourDatabaseName SET ONLINE WITH ROLLBACK IMMEDIATE

GO