hom_rcp wrote: i need a file viewer can open images ,video ,audio ,pdf ... formats . How can i find the source for it in C# or component only? I'd recommend a site called Code Project. I hear that folks sometimes have examples on that site that you can download and look at the source. You should check there. :) Definitely it isn't hard to view an image file - PictureBox will do that. Video and Audio can be viewed using the Quartz plugin or the MediaPlayer plugin. I suspect there is a PDF viewer too, though I haven't bothered looking for one. Good Luck! “You can't teach people to be lazy - either they have it, or they don't.” -Dagwood Bumstead