How to reinstall fresh database with sample data after delete the existing Database

I delete the database in my test environment and I remove the App_Data\Settings.txt and App_Data\InstalledPlugins.txt.  I receive the "No database instance" error when I run from my VS2010.  How to reinstall the db with sample data again?

Clean/Rebuild the solution and try again

Thanks a lot it works.

Thanks, this works indeed.

I tried all these solutions on Nopcommerce 3.8, and i have the same error("No database instance..."), so for those who get this issue, try this:
- delete the BIN folder on NOP.WEB project,
- delete the settings.txt file in NOP.WEB\App_Data folder (if you do not see this file in visual studio, click on "Show all files" in solution explorer menu...)
- clean and rebuild the entire solution
- finally launch application.

If you are running the version 4.1, it is enough to remove from the appsettings.json from App_Data the connectionString line and re-run the application. That will recreate the whole application from scratch