Process myProcess = new Process();

        myProcess.StartInfo.WorkingDirectory = workingDirectory;
        myProcess.StartInfo.FileName = programFilePath;
        myProcess.StartInfo.Arguments = commandLineArgs;
        myProcess.StartInfo.UseShellExecute = false;
        myProcess.StartInfo.CreateNoWindow = true;
        myProcess.StartInfo.RedirectStandardOutput = true;
        myProcess.StartInfo.RedirectStandardError = true;
        myProcess.Start();

        StreamReader sOut = myProcess.StandardOutput;
        StreamReader sErr = myProcess.StandardError;

        try
        {
            string str;

            // reading errors and output async...

            while ((str = sOut.ReadLine()) != null && !sOut.EndOfStream)
            {
              logMessage(str + Environment.NewLine, true);
              Application.DoEvents();
              sOut.BaseStream.Flush();
            }

            while ((str = sErr.ReadLine()) != null && !sErr.EndOfStream)
            {
              logError(str + Environment.NewLine, true);
              Application.DoEvents();
              sErr.BaseStream.Flush();
            }

            myProcess.WaitForExit();
        }
        finally
        {
            sOut.Close();
            sErr.Close();
        }