/// <summary>
/// Deletes item from item list
/// Deletes selected item in itemsDataGrid
/// Updates database, removing deleted item
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void deleteButton_Click(object sender, RoutedEventArgs e)
{
itemDao.addItem(sql.deleteItem(currentItem.Item_Code));
itemList.Remove(currentItem);
// Refresh DataGrid to reflect changes
itemsDataGrid.ItemsSource = itemList;
itemsDataGrid.Items.Refresh();
}