Code
public Bitmap Resized(string imageFile, string newImageFile)
        {
            Bitmap img = new Bitmap(imageFile);
            Bitmap imgOutput = new Bitmap(128,128);
            Graphics g = Graphics.FromImage(img);
            Rectangle rectTan = new Rectangle(0, 0, 128, 128);
           
            g.DrawImage(imgOutput, 0, 0, rectTan, GraphicsUnit.Pixel);

            try
            {


                imgOutput.Save(newImageFile,ImageFormat.Bmp);

                return imgOutput;

            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }

}