public async Task SubmitCreate(int pilot, string st1, string st2)
        {
            InputCrew inputCrew = new InputCrew();

            inputCrew.PilotId = pilot;
            int[] stews = { Convert.ToInt32(st1), Convert.ToInt32(st2) };
            inputCrew.StewardessIds = stews;

            await cs.Create(inputCrew);

            this.Frame.Navigate(typeof(Crews));
        }
        public async Task Update(int id, InputCrew f)
        {
            string temp = path.ToString() + "/" + id.ToString();

            await client.PutAsJsonAsync(temp, f);
        }
 public async Task Create(InputCrew f)
 {
     await client.PostAsJsonAsync(path, f);
 }