private async Task SaveCategoryAsync()
        {
            if (!await CanSaveCategoryAsync())
            {
                return;
            }

            await DialogService.DisplayPopupAsync();

            var parameters = new NavigationParameters();

            if (IsUpdated)
            {
                parameters.Add("IsUpdated", true);
            }

            if (IsNewCategory)
            {
                var categoryID = await FirebaseService.InsertCategoryAsync(Category);

                for (int i = States.Count - 1; i >= 0; i--)
                {
                    States[i].CategoryID = categoryID;
                    await FirebaseService.InsertStateAsync(States[i]);
                }
            }
            else
            {
                await FirebaseService.UpdateCategoryAsync(Category);

                foreach (var state in States)
                {
                    if (state.StateID == null)
                    {
                        await FirebaseService.InsertStateAsync(state);
                    }
                    else
                    {
                        await FirebaseService.UpdateStateAsync(state);
                    }
                }
                foreach (var state in DeletedStates)
                {
                    await FirebaseService.DeleteStateAsync(state);
                }
            }
            await DialogService.PopAsync();

            await NavigationService.GoBackAsync(parameters);
        }