private void BtnAdd_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                if (txtItem.Text != string.Empty)
                {
                    var item = itemsService.GetItem(txtItem.Text);
                    if (item != null)
                    {
                        _window.txtItem.Text         = item.Item;
                        _window.txtUoM.Text          = item.BaseUoM;
                        _window.txtDescription.Text  = item.Description;
                        _window.txtNCM.Text          = ncmService.GetNCM(item.Item);
                        _window.txtStandardCost.Text = itemsService.GetStandardCost(item.Item).ToString();
                        int?nature = itemsService.GetNatureItem(item.Item);
                        if (nature == 22413314)
                        {
                            _window.cbNature.SelectedIndex = 0;
                        }
                        else if (nature == 22413313)
                        {
                            _window.cbNature.SelectedIndex = 1;
                        }
                        else if (nature == 22413312)
                        {
                            _window.cbNature.SelectedIndex = 2;
                        }

                        _window.EnabledFields();
                        _window.isEdit = true;

                        this.Close();
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message + "\n" + ex.StackTrace, "Error",
                                MessageBoxButton.OK, MessageBoxImage.Error);
            }
        }