log4net doesn't log in myProcess.OutputDataReceived

[buchstaben]

Hi, my app logs correctly while code is beeing executed within my method DoIt. But it doesn't log in the Process.OutputDataReceived's EventHandler even if p_OutputDataReceived is called. Is there anything I need to look at while using Process?

    private void DoIt(string arguments)
    {
        \_log.Fatal("TEST"); // DOES LOG
        Process p = new Process();
        p.StartInfo.FileName = @"D:\\vssTOOLS\\NetJobs\\UpdateDealArchiveInstrSeq\\UpdateCaller\\bin\\Debug\\UpdateDealArchiveInstrSeq.exe";
        p.StartInfo.RedirectStandardError = true;
        p.StartInfo.RedirectStandardOutput = true;
        p.OutputDataReceived += new DataReceivedEventHandler(p\_OutputDataReceived);
        p.ErrorDataReceived += new DataReceivedEventHandler(p\_ErrorDataReceived);
        p.StartInfo.WorkingDirectory = System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetAssembly(typeof(Caller)).Location);
        p.StartInfo.UseShellExecute = false;
        p.StartInfo.Arguments = arguments;
        p.Start();

        p.BeginOutputReadLine();
        p.BeginErrorReadLine();

        p.WaitForExit();

        //Synchronisieren
        do
        {
            System.Threading.Thread.Sleep(100);
        } while (!p.HasExited);

        if (p.ExitCode != 0)
        {
            // DOES LOG
            for (int i = 0; i < procOut.ToString().Length; i += 2000)
                \_log.Info(procOut.ToString().Length > i + 2000 ? procOut.ToString().Substring(i, 2000) : procOut.ToString().Substring(i));
            for (int i = 0; i < procErr.ToString().Length; i += 2000)
                \_log.Error(procErr.ToString().Length > i + 2000 ? procErr.ToString().Substring(i, 2000) : procErr.ToString().Substring(i));
            throw new ApplicationException("Es ist ein Fehler aufgetreten: " + procErr.ToString());
        }
    }

    StringBuilder procOut = new StringBuilder();
    StringBuilder procErr = new StringBuilder();
    void p\_ErrorDataReceived(object sender, DataReceivedEventArgs e)
    {
        procErr.AppendLine(e.Data);
        \_log.Error(e.Data); // DOES NOT LOG
    }

    void p\_OutputDataReceived(object sender, DataReceivedEventArgs e)
    {
        procOut.AppendLine(e.Data);
        \_log.Info(e.Data); // DOES NOT LOG
    }