async void OnAddCustomerClicked() { if (Name == null || Password == null || Age == null) { System.Diagnostics.Debug.WriteLine("name, pass or age not set"); await Application.Current.MainPage.DisplayAlert("Missing Field", "Please Enter all Fields", "Ok"); } else { customer.Name = Name; customer.Password = Password; try { customer.Age = Convert.ToInt32(Age); } catch (Exception ex) { System.Diagnostics.Debug.WriteLine(ex.Message); } var mongoService = new MongoService(); await mongoService.CreateCustomer(customer); await Application.Current.MainPage.Navigation.PopAsync(); } }