string path = "c:/temp/";
            path = path.Replace("/", "\\");
            FileInfo fileInfo = new FileInfo(path);

            //check if directory exists so that 'fileInfo.Directory' doesn't throw directory not found

            ProcessStartInfo pi = new ProcessStartInfo("explorer.exe")
            {
                WindowStyle = ProcessWindowStyle.Normal,
                UseShellExecute = true,
                FileName = fileInfo.Directory.FullName,
                Verb = "open"
            };

            try
            {
                Process.Start(pi);
                Thread.Sleep(500); // can set any delay here
                SendKeys.SendWait(fileInfo.Name);
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message, ex);
            }