[HttpGet]
public ActionResult Encrypted()
{
    return View();
}

[HttpPost]
public ActionResult Encrypted(HttpPostedFileBase upload1, HttpPostedFileBase upload2, string key)
{
    string fileName1 = Path.GetFileName(upload1.FileName);
    string fileName2 = Path.GetFileName(upload2.FileName);

    upload1.SaveAs(Server.MapPath("~/Files/" + fileName1));


    Image image = Image.FromStream(upload2.InputStream);
    image.Save(Server.MapPath("~/Files/" + fileName2));
    string imagePath = Server.MapPath("~/Files/" + fileName2);
    Bitmap bmp = new Bitmap(imagePath);

    StreamReader sr = new StreamReader(Server.MapPath("~/Files/" + fileName1));
    string text = sr.ReadLine();
    text = Crypto.EncryptStringAES(text, key);

    var bmp1 = SteganoHelper.embedText(text, bmp);
    byte[] arr = bmp1.ToByteArray(ImageFormat.Bmp);

    return  File(arr, "image/bmp");

}