What is an easy way to export a database from SQL Server, including all tables and data to file.sql file?

I am using SQL Server [s] 2008 R2 [Express].

I would like to create an .sql installation file for an example database.

In file.sql, I mean the file that will be launched from Microsoft SQL Server Management Studio as a query.

I would like to have one file, including the database itself and all tables and data.

How can I export the entire database to such a file?

PS

This is a very small database.

I am not worried about duplicating the database name on the new server.

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