I loop through the code that looks like this to batch a set of pdf
files.

  Process command = new Process();
  command.StartInfo.FileName = "AcroRd32.exe";
  command.StartInfo.Arguments = "/p /h " + pdfFileName;
  command.StartInfo.RedirectStandardOutput = true;
  command.StartInfo.UseShellExecute = false;
  command.Start();  

The problem is, the order in which the documents are printed is very
important.  But it seems like Acrobat Reader and the printer scramble
the order.

Here is a very strange thing.  Right after command.Start(), I tried

  command.StandardOutput.ReadToEnd();

It USED TO WORK.  And then out of the blue, it prints the document and
just hangs until I kill Acrobat Reader.

Adding

  Thread.Sleep(10000);

Will make the order right, but only to a degree.  The order is just less
scrambled, which is not good enough.

So please help.