Process process = new Process();
            DirectoryInfo dir = new DirectoryInfo(katalogZplikamiODT);
            FileInfo[] info = dir.GetFiles("*.odt");
            foreach (FileInfo f in info)
            {

                    string arg = String.Format(" --headless --convert-to pdf --outdir " + katalogZplikamiODT + " " + f.FullName);
                    ProcessStartInfo startInfo = new ProcessStartInfo();
                    startInfo.WindowStyle = ProcessWindowStyle.Normal;
                    startInfo.FileName = @"C:\Program Files (x86)\LibreOffice 5\program\soffice.exe";
                    startInfo.Arguments = arg;
                    startInfo.UseShellExecute = true;
                    process.StartInfo = startInfo;
                    process.Start();
                    process.WaitForExit(3000);

            }