rootFolder="D:\\rootFolder\\";
static int top = 3810;
var videofilenames = Directory
.GetFiles(rootFolder, "*.*", SearchOption.AllDirectories)
.Where(s =>s.EndsWith(".mp4") || s.EndsWith(".mkv") || s.EndsWith(".wav") || s.EndsWith(".avi"));
var videotop = videofilenames.Take(top);
foreach (var myscore in videotop)
{
string Fullpath = myscore.ToString();
string videofilepath = Path.GetDirectoryName(Fullpath) + "\\";
string filename = Path.GetFileName(Fullpath);
string fileformat = Path.GetExtension(filename);
}
so now I have every thing :)