if (foundUser != null && string.Compare(password, repeatPassword, false) == 0)
{
    foundUser.Password = CreateHash(password);
    db.Entry(foundUser).State = EntityState.Modified;
    db.SaveChanges();

    return RedirectToAction("Index");
}
else if (foundUser == null)
    ModelState.AddModelError("", "User not found! Please provide correct name and e-mail");
else if (string.Compare(password, repeatPassword, false) != 0)
    ModelState.AddModelError("", "Passwords are not the same!");