private void ValidarUsuario()
{
LoginService loginService = new LoginService();
if (loginService.ValidarUsuario(this.Usuario, this.Clave))
{
this.ResultadoLogin = "******";
}
else
{
this.ResultadoLogin = "******";
}
OnPropertyChanged("ResultadoLogin");
NavigationService navigationService = new NavigationService();
navigationService.AccionLoginValido();
}