On 24 Sep 2016, at 10:14am, denis <dc4...@gmail.com> wrote:

> Hello all, I want enabling foreign key in the file app.config of visual 
> studio 2015 is-it possible? if yes, what is the string?
> I tested connectionString = "data source=d:\db.sqlite; ForeignKeys=true;"
> but the FK does not work.

Just connect as normal, then execute the SQL command

PRAGMA foreign_keys = ON

That should do it.  You should be able to test it using

PRAGMA foreign_keys

and see what the response is.  If you get nothing back then check which version 
of SQLite you're using: versions before 3.6.19 don't support foreign keys.

Simon.
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