UnhandledException handler

void CurrentDomain_UnhandledException(object sender, UnhandledExceptionEventArgs e)
{
    string msg = null;
    try
    {
        if (e.ExceptionObject is Exception)
        {
            Exception ex = (Exception) e.ExceptionObject;
            msg = renderException(ex);
        }
        else
        {
            msg = e.ExceptionObject.ToString();
        }

        CFAPControlLibrary.Service<ICFAPService>.Use(srv =>
        {
            srv.Log(string.Format("Unhandled exception in client: " + msg)); // wcf service call
        });
    }
    catch
    {
        // couldn't save the exception details at provider side
        if (msg != null)
        {
            File.AppendAllText("error.log", msg);
        }
    }
    try
    {
        if (File.Exists(dumperPath)) // path to procdump.exe
        {
            DirectoryInfo di = new DirectoryInfo(dumperPath);
            string args = string.Format("-ma -accepteula {0}", System.AppDomain.CurrentDomain.FriendlyName);
            Process.Start(di.FullName, args);
        }
    }
    catch
    {
        // coudn't write crash dump, no way to handle this
    }
}

string renderException(Exception e, StringBuilder sw = null)
{
    if (sw == null)
    {
        sw = new StringBuilder();
    }
    sw.AppendLine(e.GetType().ToString());
    sw.AppendLine(e.Message);
    sw.AppendLine(e.StackTrace);

    if (e.InnerException != null)
    {
        sw.AppendLine("Inner exception: ");
        renderException(e.InnerException, sw);
    }

    return sw.ToString();
}A