private void buttonNext0_Click(object sender, EventArgs e)
        {
            panel1.Visible = true;
            Customer2 customer = new Customer2(/*textBox1.Text,textBox2.Text,textBox3.Text,textBox6.Text*/);

            customer.Namee   = textBox1.Text;
            customer.Surname = textBox2.Text;
            customer.Number  = textBox3.Text;
            customer.Address = textBox6.Text;
            List <Customer2> cst = new List <Customer2>();

            cst.Add(customer);
            dataGridView1.DataSource = cst;
        }
        private void buttonAdd3_Click(object sender, EventArgs e)
        {
            foreach (object itemChecked in checkedListBox3.CheckedItems)
            {
                DataRowView castedItem = itemChecked as DataRowView;
                string      foodname   = castedItem["Foodname"].ToString();
                int         price      = int.Parse(castedItem["Price"].ToString());
                total += price;

                panel1.Visible = true;
                Customer2 customer = new Customer2(/*textBox1.Text,textBox2.Text,textBox3.Text,textBox6.Text*/);
                customer.addorder(textBox1.Text, textBox2.Text, textBox3.Text, textBox6.Text, foodname, price);
                cst.Add(customer);
            }
        }