How to get the SQLite in-memory data base backed up? I create the database in my Windows application. I want to take a database backup when I will close the application.
You want the SQLite Online Backup API.
As far as I know, System.Data.SQLite does not support it yet, so you'll need to write some code. The System.Data.SQLite Forum contains an example: http://sqlite.phxsoftware.com/forums/t/2403.aspx. As noted, when you patch System.Data.SQLite and call SQLite directly you do so at your own risk.