public async void OnBtnSaveAddContact_Click(object sender, EventArgs e)
        {
            if (viewModel.ContactModel.FullName == null)
            {
                await DisplayAlert(Language.thong_bao, Language.vui_long_nhap_ten_khach_hang, Language.dong);
            }
            else if (viewModel.SelectGroup == null)
            {
                await DisplayAlert(Language.thong_bao, Language.vui_long_chon_nhom_khach_hang, Language.dong);
            }
            else if (viewModel.ContactModel.Phone == null)
            {
                await DisplayAlert(Language.thong_bao, Language.vui_long_nhap_so_dien_thoai, Language.dong);
            }
            else
            {
                Contact contact = new Contact();
                contact.FullName   = viewModel.ContactModel.FullName;
                contact.Phone      = viewModel.ContactModel.Phone;
                contact.ProvinceId = viewModel.ContactModel.Province?.Id;
                contact.DistrictId = viewModel.ContactModel.District?.Id;
                contact.WardId     = viewModel.ContactModel.Ward?.Id;
                contact.Street     = viewModel.ContactModel.Street;
                contact.Address    = viewModel.ContactModel.Address;
                contact.GroupId    = viewModel.SelectGroup.Id;
                if (viewModel.CompanyId != null)
                {
                    contact.CompanyId = Guid.Parse(UserLogged.CompanyId);
                }
                ApiResponse apiResponse = await ApiHelper.Post(ApiRouter.CONTACT_ADD, contact);

                if (apiResponse.IsSuccess)
                {
                    await ModalAddContact.Hide();

                    viewModel.CancelPopUpAddContact();
                    await viewModel.LoadOnRefreshCommandAsync();

                    ToastMessageHelper.ShortMessage(Language.them_khach_hang_thanh_cong);
                }
                else
                {
                    ToastMessageHelper.ShortMessage(apiResponse.Message);
                }
            }
        }
 public async void OnBtnCancelAddContact_Click(object sender, EventArgs e)
 {
     viewModel.CancelPopUpAddContact();
     await ModalAddContact.Hide();
 }