C # Picture Lossless compression

        /// <summary>        ///image thumbnail Processing/// </summary>        /// <param name= "bytes" >Image source Data</param>        /// <param name= "Compression" >Compression Quality 1-100</param>        /// <param name= "Thumbwidth" >the width of the thumbnail image</param>        /// <param name= "Thumbheight" >the height of the thumbnail image</param>        /// <returns></returns>         Public Static byte[] Converttothumbnail (byte[] Bytes,intCompression = -,intThumbwidth =0,intThumbheight =0)        {            byte[] bs =NULL; Try            {                if(Bytes! =NULL)                {                    using(MemoryStream ms =NewMemoryStream (bytes)) {                        using(Bitmap srcimg =NewBitmap (MS)) {                            if(Thumbwidth = =0&& Thumbheight = =0) {Thumbwidth=srcimg.                                Width; Thumbheight=srcimg.                            Height; }                            using(Bitmap dstimg =NewBitmap (Thumbwidth, Thumbheight))//Picture Compression Quality                            {                                //Create a System.Drawing.Graphics object from bitmap to draw a high-quality zoomed-out diagram.                                 using(Graphics gr =graphics.fromimage (dstimg)) {                                    //draw the original image into a zoomed-out diagram above the set widthRectangle rectdestination =NewRectangle (0,0, Thumbwidth, thumbheight); Gr.                                    Clear (Color.whitesmoke); Gr.compositingquality=compositingquality.highquality; Gr. SmoothingMode=smoothingmode.highquality; Gr. Interpolationmode=interpolationmode.highqualitybicubic; Gr. DrawImage (srcimg, Rectdestination,0,0, Srcimg. Width, Srcimg.                                    Height, GraphicsUnit.Pixel); EncoderParameters EP=NewEncoderParameters (1); Ep. param[0] =NewEncoderparameter (System.Drawing.Imaging.Encoder.Quality, compression);//set the scale of the compression 1-100imagecodecinfo[] Arrayici =imagecodecinfo.getimageencoders (); ImageCodecInfo Jpegiciinfo= Arrayici.firstordefault (t = = T.formatid = =System.Drawing.Imaging.ImageFormat.Png.Guid); using(MemoryStream Dstms =NewMemoryStream ()) {                                        if(Jpegiciinfo! =NULL) {dstimg.                                        Save (Dstms, Jpegiciinfo, EP); }                                        Else{dstimg. Save (Dstms, System.Drawing.Imaging.ImageFormat.Png);//Save in memory} BS=NewByte[dstms.                                        Length]; Dstms. Position=0; Dstms. Read (BS,0, BS.                                    Length);                }                                }                            }                        }                    } }            }            Catch(Exception ex) {LogManager.DefaultLogger.Error (Logconvert.parsewebex (ex),string. Concat ("converttothumbnail error.", Thumbwidth," ", Thumbheight)); }            returnBS; }

C # Picture Lossless compression