public ActionResult LogIn(SignInViewModel model, string returnUrl)
        {
            if (ModelState.IsValid)
            {
                if (_authenticationService.AuthenticateUser(model.SignInUserName, model.SignInPassword))
                {
                    //get accountId for this user
                    int accountId = _membershipService.GetAccountId(model.SignInUserName);
                    //create the authTicket that will hold user data
                    string ticket = model.SignInUserName + "|" + accountId;

                    _authenticationService.LogIn(ticket, createPersistentCookie: true);


                    if (!String.IsNullOrEmpty(returnUrl))
                    {
                        return(Redirect(returnUrl));
                    }
                    else
                    {
                        return(RedirectToAction("Index", "Home"));
                    }
                }
                else
                {
                    ModelState.AddModelError("", "Incorrect username or password");
                    return(View());
                }
            }
            else
            {
                return(View());
            }
        }