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public string FormatBytes(long bytes)
{
  const int scale = 1024;
  string[] orders = new string[] { "GB", "MB", "KB", "Bytes" };
  long max = (long)Math.Pow(scale, orders.Length - 1);
 
  foreach (string order in orders)
  {
    if ( bytes > max )
      return string.Format("{0:##.##} {1}", decimal.Divide( bytes, max ), order);
 
    max /= scale;
  }
  return "0 Bytes";
}

public string FormatBytes(int Bytes)
{
  string filesize;
  if (Bytes >= 1073741824)
  {
    decimal size = decimal.Divide(Bytes, 1073741824);
    filesize = string.Format("{0:##.##} GB", size);
  }
  else if (Bytes >= 1048576)
  {
    decimal size = decimal.Divide(Bytes, 1048576);
    filesize = string.Format("{0:##.##} MB", size);
  }
  else if (Bytes >= 1024)
  {
    decimal size = decimal.Divide(Bytes, 1024);
    filesize = string.Format("{0:##.##} KB", size);
  }
  else if (Bytes > 0 & Bytes < 1024)
  {
    decimal size = Bytes;
    filesize = string.Format("{0:##.##} Bytes", size);
  }
  else
  {
    filesize = "0 Bytes";
  }
  return filesize;
}