A string specifying the name of the database. The default is a null reference (Nothing in Visual Basic).
When a database is started, it is assigned a database name, either explicitly with the dbn parameter, or by UltraLite using
the base of the file name with the extension and path removed.
When opening connections, UltraLite first searches for a running database with a matching dbn parameter. If one is not found,
UltraLite starts a new database using the appropriate database file name parameter (the DatabaseOnDevice or DatabaseOnDesktop
This parameter is required if the application (or UltraLite engine) needs to access two different databases that have the
same base file name.