Open after Microsoft SQL Server 2005 -> SQL Server Management Studio Express-> click connect to server-> column at left, right mouse select datbase, select attach ...-> click to add -> browse file mdf to and LDF , output file current file mdf and to LDF trong SQL Server Management Studio Express, but when click Ok to end to finish warning error, for this error report to the right click column information for error, and this is the error, you see attach file: only how to help this error, thanks