Image Compression without lossing Quality

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C#

Hai good evening to all in my project customers upload their photographs how can i Compressed that photographs without lossing quality.
System.Drawing.Bitmap newBMP = new System.Drawing.Bitmap(originalBMP);
ImageCodecInfo jgpEncoder = GetEncoder(ImageFormat.Jpeg);
EncoderParameters myEncoderParameters = new EncoderParameters(1);
System.Drawing.Imaging.Encoder myEncoder = System.Drawing.Imaging.Encoder.Quality;
EncoderParameter myEncoderParameter = new EncoderParameter(myEncoder, 150L);
myEncoderParameters.Param[0] = myEncoderParameter;

private ImageCodecInfo GetEncoder(ImageFormat format)
        {
            ImageCodecInfo[] codecs = ImageCodecInfo.GetImageDecoders();
            foreach (ImageCodecInfo codec in codecs)
            {
                if (codec.FormatID == format.Guid)
                {
                    return codec;
                }
            }
            return null;
        }

i used the above coding but not the image size reduced and quality also reduced please help me 





                                  thanks in advance

                                         By
                                      Meganathan M