Rename SQL 2005 Database - Error: The database could not be exclusively locked to perform the operation.

During database restore, I tried to rename existing database in SQL Server 2005 by simply trying following command:
ALTER DATABASE mydatabase MODIFY NAME = mydatabase_OLD

But it didn't work and gave following error:
"The database could not be exclusively locked to perform the operation."

In order to fix, I had to set it to single user for a while, change the name and then set it back to multi-user.

I had to execute following commands to make it work:

ALTER DATABASE mydatabase SET SINGLE_USER WITH ROLLBACK IMMEDIATE
GO
ALTER DATABASE mydatabase MODIFY NAME = mydatabase_OLD
GO
ALTER DATABASE mydatabase_OLD SET MULTI_USER
GO

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