I am using SQL Express databases as part of a unit test project in c#. My databases is located here:

```none
./Databases/MyUnitTestDB.mdf

```

I would like to use a relative path or variable in the `app.config` rather than having my connection string defined as:

```none
AttachDbFilename=C:\blah\blah\blah\yea\yea\yea\MyApplication\Databases\MyUnitTestDB.mdf 

```

I have seen the use of `|DataDirectory|` but am I correct in thinking this is only applicable to web applications?

I want to control this in the application configuration file, as in production the application uses a hosted sql database.