C#5 to generate thumbnails

Using System;
Using System.Collections.Generic;
Using System.Linq;
Using System.Text;
Using System.Drawing;

Using System.IO;
            Namespace MyTest {class Imgthumbnail {public enum mode {W, H, HW, cut, MAXHW} public Imgthumbnail () {}///<sum mary>///generate thumbnails///</summary>///<param name= "Originalimagepath" > Source map Path (physical path) </p aram>///<param name= "Thumbnailpath" > Thumbnail path (physical path) </param>///<param name= "width" > Thumbnail Width </param>///<param name= "height" > Thumbnail height </param>///<param name= "mode" > How to Generate Thumbnails &
        lt;/param> public static Image Makethumbnail (string originalimagepath, int width, int height, mode m) {if (!
            File.exists (Originalimagepath)) {return null; } Image Originalimage = Image.FromFile (Originalimagepath);
            int towidth = width;

            int toheight = height;
            int x = 0;
            int y = 0;
            int ow = Originalimage.width;

            int oh = originalimage.height; Switch (m) {case mode. Maxhw:if ((Ow/width) > (ow/height)) {towidth = WI
                        Dth
                        Toheight = (Int32) math.ceiling (Convert.todecimal ((OH * towidth)/ow)); if (Toheight > height) {towidth = Convert.ToInt32 (Towidth * (conve Rt.
                            ToDecimal (height)/toheight));
                        Toheight = height;
                        } else {toheight = height;
  Towidth = (Convert.ToInt32 (math.ceiling convert.todecimal (OW * toheight))/OH);                      if (Towidth > width) {toheight = Convert.toi
                            Nt32 (Toheight * convert.todecimal (width)/towidth);
                        Towidth = width;
                }} break; Case mode.
                HW://Specifies the width scaling (possibly deformed) break; Case mode.
                    w://specified wide, high proportionally toheight = Originalimage.height * width/originalimage.width;
                Break Case mode.
                    h://specified high, wide proportional towidth = Originalimage.width * height/originalimage.height;
                Break Case mode. CUT://Specifies width cut (not deformed) if (double) originalimage.width/(double) originalimage.height >
                        (double) towidth/(double) toheight) {oh = Originalimage.height; ow = Originalimage.Height * towidth/toheight;
                        y = 0;
                    x = (Originalimage.width-ow)/2;
                        else {ow = Originalimage.width;
                        Oh = originalimage.width * height/towidth;
                        x = 0;
                    y = (Originalimage.height-oh)/2;
                } break;
            Default:break; } towidth = towidth > ow?
            Ow:towidth; Toheight = toheight > Oh?
            Oh:toheight;
            if (Toheight = = 0 | | towidth = 0) {return null;

            //new BMP picture Image bitmap = new System.Drawing.Bitmap (towidth, toheight);

            Create a new artboard Graphics g = System.Drawing.Graphics.FromImage (bitmap); Set high quality interpolation method G.interpolationmode = System.Drawing.Drawing2D.

            Interpolationmode.high;

            Set high quality, low speed rendering smooth degree g.smoothingmode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

            Empty the canvas and fill the g.clear with a transparent background color (color.transparent); Draws the specified portion of the original picture at the specified location and at the specified size g.drawimage (originalimage, New Rectangle (0, 0, Towidth, toheight), NE

            W Rectangle (x, Y, Ow, OH), graphicsunit.pixel);
                try {return bitmap; Save thumbnail//bitmap in jpg format.
            Save (Thumbnailpath, System.Drawing.Imaging.ImageFormat.Jpeg);
                catch (System.Exception e) {return null;
            Throw e;
                finally {originalimage.dispose (); Bitmap.
                Dispose ();
            G.dispose ();
 }
        }
    }
}