c# server side image resize - GetByteArrayFromImage

        BinaryImage.ContentBytes = GetByteArrayFromImage(); 
        BinaryImage.Width =250;
        BinaryImage.Height =320;

        BinaryImage.ImageSizeMode = (ImageSizeMode)ComboBoxImageSizeMode.Value; 

//................................
protected byte[] GetByteArrayFromImage() {
        byte[] byteArray = null;
        using(FileStream stream = new FileStream(Server.MapPath(ImageFileName), FileMode.Open, FileAccess.Read)) {
            byteArray = new byte[stream.Length];
            stream.Read(byteArray, 0, (int)stream.Length);
        }
        return byteArray;
    }