gistfile1.cs

        public static Image ToSize(this Image image, int width, int height)
        {
            var resizedImage = new Bitmap(width, height);
            using (var graphics = Graphics.FromImage(resizedImage))
            {
                graphics.SmoothingMode = SmoothingMode.HighQuality;
                graphics.CompositingQuality = CompositingQuality.HighQuality;
                graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
                graphics.DrawImage(image, 0, 0, width, height);
            }

            return resizedImage;
        }