ObjectDisposedException

private void UpdateOrder_Load(object sender, EventArgs e)
        {
            this.ordersTableAdapter.Fill(this.aSPNETDB_DataSet.Orders);
            IDOrder orderIDFrm = new IDOrder();
            orderIDFrm.ShowDialog();
            OrderID = orderIDFrm.ReturnedID;
            if (OrderID != 0)
            {
                Text = "Order " + OrderID.ToString();
                SqlConnection connection = CreateConnection();
                using (connection)
                {
                    SqlCommand command = new SqlCommand(
                        "SELECT OrderID, UserName, CustEmail, ProdName, ProdPrice, Quantity, ShipperName, PaymentTypeName, OrderDate, DeliveryNotes, OrderAmount FROM Orders WHERE OrderID=@ordID", connection
                        );
                    SqlParameter par = new SqlParameter("@ordID", SqlDbType.Int);
                    par.Value = OrderID;
                    command.Parameters.Add(par);

                    try
                    {
                        connection.Open();
                        SqlDataReader reader = command.ExecuteReader();

                        while (!reader.HasRows)
                        {
                            orderIDFrm.Dispose();
                            MessageBox.Show("There is no product with this ID! Please enter an existing ID!");
                            orderIDFrm.ShowDialog();
                        }
                        if (reader.HasRows)
                        {
                            DataTable dt = new DataTable();
                            dt.Load(reader);
                            ordersDataGridView.DataSource = dt;
                        }
                        reader.Close();
                    }
                    catch (SqlException se)
                    {
                        MessageBox.Show(se.Message.ToString());
                    }
                }
                orderIDFrm.Dispose();
            }
            else if (OrderID == 0)
            {
                //orderIDFrm.Dispose();
                this.BeginInvoke(new MethodInvoker(orderIDFrm.Dispose));
            }
        }