format size as bytes, kb, mb, gb

gistfile1.cs

public static string FormatBytes(long bytes, 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";
}