If you want to move database physical files, you should take the database offline by using the "ALTER DATABASE" statement with the following syntax:

ALTER DATABASE database_name SET OFFLINE

The following tutorial example will bring "GlobalGuideLine" offline:

ALTER DATABASE GlobalGuideLine SET OFFLINE

GO

SELECT name, state_desc from sys.databases

GO

name state_desc

master ONLINE

tempdb ONLINE

model ONLINE

msdb ONLINE

GlobalGuideLine OFFLINE

USE GlobalGuideLine

GO

Msg 942, Level 14, State 4, Line 1

Database 'GlobalGuideLine' cannot be opened because

it is offline.