asp.net从VS2008移植到IIS连接字符串居然不一样

VS 2008下：Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\Suda_DB.mdf;Integrated Security=True;User Instance=True

iis下：return @"Data Source=.\SQLExpress;Integrated Security=true; AttachDbFilename=|DataDirectory|\Suda_DB.mdf;User Instance=true;";