I moved a database from a 2005 SQL server with no named Instance to a 2005 SQL server with a named Instanced, I changed the connection string to reflect the new server name however when I rebuild the C# solution and launch the application it's says I'm missing the instance name. I tried adding the instance to the server name i.e. gpvelocity"+"5.gpsecurity\HIRSCH and it didn't work.
This is the original connection string to the old server which works:
sqlConn.ConnectionString = "user id=sa;data source=gpvelocity" + "6.gpsecurity;persist security info=True;initial catalog=Velocity;password=123";