private void buttonAddCust_Click(object sender, EventArgs e)
        {
            bool refresh = false;

            using (MakeCustomer newCustForm = new MakeCustomer(this))
            {
                if (newCustForm.ShowDialog() == DialogResult.OK)
                {
                    refresh = true;
                }
            }
            if (refresh)
            {
                refreshData();
            }
        }
        private void buttonModifyCust_Click(object sender, EventArgs e)
        {
            bool            refresh    = false;
            DataGridViewRow row        = customerDataGridView.SelectedRows[0];
            int             customerId = Convert.ToInt32(row.Cells["custDgvCustId"].Value);

            using (MakeCustomer modifyCustomerForm = new MakeCustomer(this, customerId))
            {
                if (modifyCustomerForm.ShowDialog() == DialogResult.OK)
                {
                    refresh = true;
                }
            }
            if (refresh)
            {
                refreshData();
            }
        }