SmartAssembly allows you to use any version of SQL for its internal database. This will help you connect to LocalDB.

For LocalDB, the connection string usually takes the form Server=(LocalDB)\mssqllocaldb​
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Please note, in case of having more than one version of LocalDB installed, this connects to the default instance.

Requirements

SmartAssembly 6.12+

LocalDB.

Each instance of Smart Assembly will need it's settings updated to point to this db.