public async void AddGuest(Guest PostGuest)
        {
            await CRUD.PostGuestHttp(PostGuest);

            LoadGuestJson();
        }
        public async void EditGuest(Guest EditGuest)
        {
            await CRUD.ChangeGuestHTTP(EditGuest);

            LoadGuestJson();
        }
        public async void DeleteGuest(Guest GuestDelete)
        {
            await CRUD.DeleteGuestHTTP(GuestDelete);

            LoadGuestJson();
        }