is there a way to show 'order table and customer table' to one dataGridView?

Question

 private void button3_Click(object sender, EventArgs e)
    {
        Stack<Customer> customer = new Stack<Customer>();
        Stack<Order> orders = new Stack<Order>();
        SqlConnection con = new SqlConnection();
        con.ConnectionString = @"Data Source=.\SQLExpress;Initial Catalog=Northwind;Integrated Security=true";
        if (con.State == ConnectionState.Closed)
        {
            con.Open();
            SqlCommand cmd = new SqlCommand("select Top 5 ContactName,Freight from Orders,Customers WHERE Orders.CustomerID=Customers.CustomerID ORDER BY Freight DESC;", con);
            SqlDataReader reader = cmd.ExecuteReader();
            while (reader.Read())
            {
                Customer c = new Customer();
                c.ContactName = (string)reader["ContactName"];
                Order o = new Order();
                o.Freight = (decimal)reader["Freight"];
                orders.Push(o);
                customer.Push(c);
            }
           
            con.Close();
        }
       
        dataGridView3.DataSource = customer.ToList();
        dataGridView4.DataSource = orders.ToList();
    }

I'm trying to get top 5 users name and detail using Stack but I can't show both orders and customer table to one datagridview