C # ASP. NET scale-down code (Basic edition)

I'm not going to say much.

if(request.files["file1"] ==NULL) {Response.Write ("<script>alert (\ "Please select Upload file!\") </script>"); }        Else        {            //Get Picture Format            stringFileExtension = Path.getextension (request.files["file1"].            FileName); if(FileExtension = =". jpg")            {                //Picture Save Path                stringSavepath = Server.MapPath (@"~/uploadpic/"); //take the picture streamStream Sam = request.files["file1"].                InputStream; //take the picture stream and save the image .System.Drawing.Image im =System.Drawing.Image.FromStream (SAM); //Original Width                intOwidth =im.                Width; //Original Height                intOheight =im.                Height; //set thumbnail initial width                intTwidth = About; //set thumbnail initial height                intTheight = the; //create an empty BMP pictureBitmap BT =NewBitmap ( About, the); //calculates the width and height of the thumbnail proportionally                if(Owidth >=oheight) Theight= (int) Math.floor (convert.todouble (oheight) * (convert.todouble (twidth)/convert.todouble (owidth)); ElseTwidth= (int) Math.floor (convert.todouble (owidth) * (convert.todouble (theight)/convert.todouble (oheight)); //Center Picture                intPWidth = ( About-Twidth)/2; intPheight = ( the-Theight)/2; //create an instance of a drawing pictureGraphics g =Graphics.fromimage (BT); //Control picture qualityG.interpolationmode =System.Drawing.Drawing2D.InterpolationMode.Low; //control anti-aliasingG.smoothingmode =System.Drawing.Drawing2D.SmoothingMode.HighQuality; //Set Transparent Backgroundg.clear (color.transparent); //generate thumbnail imagesG.drawimage (IM,NewRectangle (PWidth, Pheight, Twidth, Theight),NewRectangle (0,0, Owidth, oheight), GraphicsUnit.Pixel); //Save PictureBt. Save (string. Format ("{0}{1}.png", Savepath, DateTime.Now.ToString ("yyyymmddhhmmss_yyyy") ), imageformat.png); }            Else{Response.Write ("<script>alert (\ "Picture format is incorrect!\") </script>"); }        }

Reprint Please specify!

C # ASP. NET scale-down code (Basic edition)