کاهش حجم تصویر در C#.NET

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        public static void ImageQualityLevel()
        { 
            var bitmap = new System.Drawing.Bitmap(@"C:\TestPhoto.bmp");
            var imageEncoder = GetEncoder(System.Drawing.Imaging.ImageFormat.Jpeg);
            var encoderType = System.Drawing.Imaging.Encoder.Quality;
            var encoderParameters = new System.Drawing.Imaging.EncoderParameters(1);
            var imageQuality = 50L;
            var parameter = new System.Drawing.Imaging.EncoderParameter(encoderType, imageQuality);

            encoderParameters.Param[0] = parameter;
            bitmap.Save(@"C:\TestPhotoQualityFifty.bmp", imageEncoder, encoderParameters);
            bitmap.Dispose();
        }

        private static System.Drawing.Imaging.ImageCodecInfo GetEncoder(System.Drawing.Imaging.ImageFormat format)
        {
            var codecs = System.Drawing.Imaging.ImageCodecInfo.GetImageDecoders();

            foreach (var codec in codecs)
            {
                if (codec.FormatID == format.Guid)
                {
                    return codec;
                }
            }
            return null;
        }