private bool ValidateLogOn(LogOnModel model)
        {
            if (String.IsNullOrEmpty(model.Username))
            {
                ModelState.AddModelError("Username", "You must specify a username.");
            }
            if (String.IsNullOrEmpty(model.Password))
            {
                ModelState.AddModelError("Password", "You must specify a password.");
            }

            return ModelState.IsValid;
        }
		public ActionResult Post(LogOnModel model)
		{
            if (!ValidateLogOn(model))
			{
				return View();
			}

			if (!String.IsNullOrEmpty(model.ReturnUrl))
			{
				return Redirect(model.ReturnUrl);
			}
		    
            return RedirectToAction("Index", "Home");
		}