C# :: Connection String With Relative Path

I have my application database in the AppDataRoaming folder. I'm trying to create a connection string for Telerik reporting, up until now I've had a connection string in a settings class that is put together like this:

The path is:

data source=C:UsersSynlightAppDataRoamingAppNamedataAppDB.sqlite

I've tried files paths like this:

%AppData%RoamingAppDatadataAppDB.sqlite

and

Server.MapPath(@"~App_DataRoamingAppDatadataAppDB.sqlite

(those are not the real directory names, of course). How do I create a connection string that will work on target machines?