Wait for a file to be ready

gistfile1.txt

public static void WaitFileReady(string fileName)
        {
            while (true)
            {
                try
                {
                    using (Stream stream = File.Open(fileName, FileMode.Open, FileAccess.Read, FileShare.Read))
                    {
                        if (stream != null)
                        {
                            Trace.WriteLine(string.Format("Output file {0} ready.", fileName));
                            break;
                        }
                    }
                }
                catch (FileNotFoundException ex)
                {
                   Trace.WriteLine(string.Format("Output file {0} not yet ready ({1})", fileName, ex.Message));
                }
                catch (IOException ex)
                {
                    Trace.WriteLine(string.Format("Output file {0} not yet ready ({1})", fileName, ex.Message));
                }
                catch (UnauthorizedAccessException ex)
                {
                    Trace.WriteLine(string.Format("Output file {0} not yet ready ({1})", fileName, ex.Message));
                }
                Thread.Sleep(500);
            }
        }