private void AddButton_Click(object sender, EventArgs e)
{
var productIDs = ProductGrid.SelectedRows.Cast <DataGridViewRow>()
.Select(x => (int)x.Cells[ProductGrid_ID.Name].Value.AsInt())
.ToList();
using (var repository = new SaleRepository())
{
repository.AddSaleItems(saleID, productIDs);
repository.Commit();
}
Close();
}