Create File encounters OS error 5 Access Denied

Create File encounters OS error 5 Access Denied
An error occurs when you use the C # program to execute SQL statements to create a database:
Create File encounters OS error 5 (Access denied.

The causes and solutions are as follows:
This is because the SQL server startup account (generally system or an operating system administrator) does not have the permission to create files on drive C. Run services. msc, find the SQL Server service in the Service Manager, and view the "Logon" tab. Select a local user and restart the service.

Or start SQL Server Configuration Manager to modify the login identity of the SQL Server service.

Create File encounters OS error 5 Access Denied