Пытаюсь изменить картинку, а получаю
Cannot implicitly convert type 'byte[]' to 'System.IO.Stream' 
Помогите преобразовать массив байтов в поток:

private static Stream ResizeImage(HttpContext context)
    {
        using (System.Drawing.Image oldImage = System.Drawing.Image.FromStream(File.OpenRead(context.Server.MapPath("CompProductsImage.gif"))))
        {
            Size newSize = CalculateDimensions();
            using (Bitmap newImage = new Bitmap(newSize.Width, newSize.Height, PixelFormat.Format24bppRgb))
            {
                using (Graphics canvas = Graphics.FromImage(newImage))
                {
                     //
                    canvas.DrawImage(oldImage, new Rectangle(new Point(0, 0), newSize));
                    MemoryStream m = new MemoryStream();
                    newImage.Save(m, ImageFormat.Jpeg);
                   
                    return m.GetBuffer();
                }
            }
        }
    }


    private static Size CalculateDimensions()
    {
        Size newSize = new Size();
       
        newSize.Width = 70;
         newSize.Height = 70;
       
        return newSize;
    }