Image size reduce C#



using System.IO;
using System.Drawing.Drawing2D;
using System.Drawing;
using System.IO;




private Stream TrimeImage(Stream StreamOriginalImage,int DispMaxWidth, int DispMaxHeight)
        {
            Bitmap mg = new Bitmap(StreamOriginalImage);
            Size newSize = new Size(Convert.ToInt32(DispMaxWidth), Convert.ToInt32(DispMaxHeight));
         
            double ratio = 0d;
            double myThumbWidth = 0d;
            double myThumbHeight = 0d;
            int x = 0;
            int y = 0;

            Bitmap bp;

            if ((mg.Width / Convert.ToDouble(newSize.Width)) > (mg.Height /
            Convert.ToDouble(newSize.Height)))
                ratio = Convert.ToDouble(mg.Width) / Convert.ToDouble(newSize.Width);
            else
                ratio = Convert.ToDouble(mg.Height) / Convert.ToDouble(newSize.Height);
            myThumbHeight = Math.Ceiling(mg.Height / ratio);
            myThumbWidth = Math.Ceiling(mg.Width / ratio);

            //Size thumbSize = new Size((int)myThumbWidth, (int)myThumbHeight);
            Size thumbSize = new Size((int)newSize.Width, (int)newSize.Height);
            bp = new Bitmap(newSize.Width, newSize.Height);
            x = (newSize.Width - thumbSize.Width) / 2;
            y = (newSize.Height - thumbSize.Height);
            // Had to add System.Drawing class in front of Graphics ---
            System.Drawing.Graphics g = Graphics.FromImage(bp);
            g.SmoothingMode = SmoothingMode.HighQuality;
            g.InterpolationMode = InterpolationMode.HighQualityBicubic;
            g.PixelOffsetMode = PixelOffsetMode.HighQuality;
            Rectangle rect = new Rectangle(x, y, thumbSize.Width, thumbSize.Height);
            g.DrawImage(mg, rect, 0, 0, mg.Width, mg.Height, GraphicsUnit.Pixel);

            MemoryStream memoryStream = new MemoryStream();
            if (bp != null)
            {
                bp.Save(memoryStream, System.Drawing.Imaging.ImageFormat.Jpeg);
            }

            return memoryStream;
        }





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