Database cannot be opened due to inaccessible files or insufficient memory or disk space

Msg 945, Level 14, State 2, Line 1
Database 'db' cannot be opened due to inaccessible files or insufficient memory or disk space. See the SQL Server errorlog for details.

One of my friends called me that their application is giving error message of disk space , and i asked him to increase the space of drive. later he responded me that he shrinked the files and space has been raised to 70GB, but the error is still there.
I asked him to access the Database through management studio
When he tried to access the database, through a query or by trying to look at the database properties in Management Studio, he got the following message:

Database 'db' cannot be opened due to inaccessible files or insufficient memory or disk space. See the SQL Server errorlog for details.


Here is Solution/Fix/workaround of this problem.

1. check the DB status, most of the time , it will return 1

use master
select databaseproperty('dbname','isShutdown')

2. Change the database to offline to clear the db status

use master
alter database dbname set offline

3. Now change the database to online, at this step log file and data files will be verified by sql server


use master
alter database dbname set online


This solution solved the problem.