public static class ImageExtentions
        {
                public static byte[] ToByteArray(this Image image, ImageFormat imageFormat)
                {
                        using (MemoryStream ms = new MemoryStream())
                        {
                                image.Save(ms, imageFormat);
                                return ms.ToArray();
                        }
                }
        }

public static class StringExtentions
{
        public static String Format(this String str, params Object[] args)
        {
                return String.Format(str, args);
        }

        public static String Format(this String str, IFormatProvider provider, params Object[] args)
        {
                return String.Format(provider, str, args);
        }
}