... to use prior to this problem was Data Source=.\SQLEXPRESS;AttachDbFilename=d:\data\StringTmp.mdf;Integrated Security=True;Connect Timeout=30;User Instance=true Now I get error from testing the connection as ... in database 'master'. An attempt to attach an auto-named database for file d:\data\IeI\gp\AppCom\IeStringTmp.mdf failed. A database with the same name exists, or specified file...