How do I connect to an .mdf (Microsoft SQL Server Database File) in a simple web project?
A great resource I always keep around is connectionstrings.com. It’s really handy for finding these connection strings when you can’t find an example. Particularly this page applied to your problem Attach a database file on connect to a local SQL Server Express instance Driver={SQL Native Client};Server=.\SQLExpress;AttachDbFilename=c:\asd\qwe\mydbfile.mdf; Database=dbname;Trusted_Connection=Yes;