search the selected folder

[ursdhivi]

how to search the selected folder content ?

[tlhintoq]

System.IO.Direc tory.GetFiles()

Look it up on MSDN

[ursdhivi]

search the file content

how to search the file content without open the file?

[tlhintoq]

how to search the file content without open the file?

You can't. You have to open the file to search it's contents. That doesn't mean you have to *display* the file. But you'll have to open it *at least in memory* to go through it.