private void GenerateAssignments(object sender, RoutedEventArgs e)
        {
            bool assignGifts = this.comboBox.Text.Equals("Yes") ? true : false;

            if (this.checkBox.IsVisible)
            {
                assignGifts = this.checkBox.IsChecked.Value;
            }
            string errorMessage = GiftManager.GenerateAssignments(assignGifts);

            if (!string.IsNullOrEmpty(errorMessage))
            {
                MessageBox.Show(errorMessage);
                return;
            }
            this.UpdateList();
        }