private void btn_ekle_Click(object sender, EventArgs e)
{
int orderID = OrderBLL.AddOrders(CustomerID, Convert.ToInt32(comboBox1.SelectedValue));
Product product = ProductBLL.GetProduct((int)dataGridView1.SelectedRows[0].Cells["ProductID"].Value);
OrderDetailBLL.AddOrderDetails(orderID, product);
}
