Am I doing this right. Hashing a text file

From: Anders Jansson (anders.jansson_at_araelektroniks.se)
Date: 05/25/04 

Date: Mon, 24 May 2004 15:21:04 -0700

Hi!

Just wanted a confirmation about hashing an entire file correctly.
Does this code really read all bytes from the file while calculating the hash value?

--Code MC++ start

Byte [] HashFile(String fileName)
{
  if (File::Exists(fileName))
  {
      System::IO::FileStream * file = File::OpenRead(fileName);

      // This is one implementation of the abstract class MD5.
      MD5 md5 = new MD5CryptoServiceProvider();

      return = md5.ComputeHash(file);
  }
}
--Code MC++ end

/Thanks

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