private void update_button_Click(object sender, EventArgs e)
        {
            CustomerDB custDB = new CustomerDB();
            if (!string.IsNullOrWhiteSpace(custId_textBox.Text))
            {
                int custId = Convert.ToInt32(custId_textBox.Text);
                if (Convert.ToInt32(custId_textBox.Text) <= 0)
                {
                    if (dataLoaded)
                    {
                        if (custDB.selectCustomer(custId))
                        {
                            string firstName = first_name_textBox.Text;
                            string lastName = last_name_textBox.Text;
                            string address = address_textBox.Text;
                            string city = city_textBox.Text;
                            string state = state_comboBox.SelectedItem.ToString();
                            int postalCode = Convert.ToInt32(postal_code_textBox.Text);
                            string country = country_comboBox.SelectedItem.ToString();
                            DateTime dob = dobPicker.Value;
                            string ssn = ssn_textBox.Text;
                            string phone = cell_phone_textBox.Text;
                            string email = email_textBox.Text;
                            string username = uname_textBox.Text;
                            string password = password_textBox.Text;

                            if (custDB.updateData(Convert.ToInt32(custId_textBox.Text), firstName, lastName, address, city, state, postalCode, country, dob, ssn, phone, email, username, password))
                            {
                                MessageBox.Show("Data updated successfully");
                            }
                        }
                        else
                        {
                            MessageBox.Show("Invalid Customer ID");
                            editCustomer_clearUp();
                        }
                    }
                }
            }
            else
            {
                MessageBox.Show("Please enter Customer ID");
                editCustomer_clearUp();
            }
        }