Copying a stream to another stream

It’s obvious that the ability to copy the contents of one stream to another is something that you’re likely to want to do fairly regularly. I vaguely recall that this will be added to some version of the .NET Framework but until that time, here’s a simple implementation that should do the trick. It could easily be converted into an extension method so it plays better in the .NET 3 world.

    /// <summary>
    /// Copies a stream to another stream
    /// </summary>
    /// <param name="copyFrom">The stream to copy from</param>
    /// <param name="copyTo">The stream to copy to</param>
    public static void CopyTo(Stream copyFrom, Stream copyTo)
    {
      const int buffSize = 128;
      byte[] buff = new byte[buffSize];
      int count;
      do
      {
        count = copyFrom.Read(buff, 0, buffSize);
        copyTo.Write(buff, 0, count);
      }
      while (count > 0);
    }