thanks to ASP.NET Image / Photo Cropper in C#

You can skip to the demo by clicking here
You can download the source code by clicking here

Sanjay Uttam used javascript obtained from http://www.defusion.org.uk/code/javascript-image-cropper-ui-using-prototype-scriptaculous/

Source : PhotoCropperASP.NetC#.zip (501.17 kb)

XPS Doc: ASP.NET C# - Image Or Photo Cropping.xps (547.48 kb)

protected byte[] CropImageFile(byte[] imageFile, int targetW, int targetH, int targetX, int targetY)
    {
        MemoryStream imgMemoryStream = new MemoryStream();
        System.Drawing.Image imgPhoto = System.Drawing.Image.FromStream(new MemoryStream(imageFile));

        Bitmap bmPhoto = new Bitmap(targetW, targetH, PixelFormat.Format24bppRgb);
        bmPhoto.SetResolution(72, 72);
  
        Graphics grPhoto = Graphics.FromImage(bmPhoto);
        //Adjust settings to make this as high-quality as possible 
        grPhoto.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
        grPhoto.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
        grPhoto.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.HighQuality;

        try
        {
            grPhoto.DrawImage(imgPhoto, new Rectangle(0, 0, targetW, targetH),
                                targetX, targetY, targetW, targetH, GraphicsUnit.Pixel);
            //Only JPG format for this demo
            bmPhoto.Save(imgMemoryStream, System.Drawing.Imaging.ImageFormat.Jpeg);
        }
        catch (Exception e)
         ... //removed code to stay concise
        return imgMemoryStream.GetBuffer();
    }