NerdDinner.Controllers.AccountController.ValidateLogOn C# (CSharp) Method

        private bool ValidateLogOn(string userName, string password)
        {
            if (String.IsNullOrEmpty(userName)) {
                ModelState.AddModelError("username", Resources.Resources.YouMustSpecifyUsername);
            }
            if (String.IsNullOrEmpty(password)) {
                ModelState.AddModelError("password", Resources.Resources.YouMustSpecifyPassword);
            }
            if (!MembershipService.ValidateUser(userName, password)) {
                ModelState.AddModelError("_FORM", Resources.Resources.UsernamePasswordIncorrect);
            }

            return ModelState.IsValid;
        }