private async void GetPaymentsMethods()
        {
            cboPaymentMethod.DisplayMemberPath = "Name";
            cboPaymentMethod.SelectedValuePath = "Id";
            cboPaymentMethod.ItemsSource       = await PaymentsMethods.getList();

            cboPaymentMethod.SelectedIndex = 0;
        }
        private async void LoadPaymentsMethods()
        {
            List <PaymentMethod> paymentMethods = await PaymentsMethods.getList();

            txtPaymentMethod.ItemsSource       = paymentMethods;
            txtPaymentMethod.SelectedValuePath = "Id";
            txtPaymentMethod.DisplayMemberPath = "Name";
            txtPaymentMethod.SelectedValue     = 1;
        }