private void EditCustomer()
        {
            if (dataGridCustomers.SelectedRows.Count == 0)
            {
                return;
            }


            Customer customer = new Customer();

            int.TryParse(Convert.ToString(dataGridCustomers.SelectedRows[0].Cells[0].Value), out customer.CustomerID);
            customer.CustomerName      = dataGridCustomers.SelectedRows[0].Cells[1].Value.ToString(); //TODO
            customer.WorkDescription   = dataGridCustomers.SelectedRows[0].Cells[2].Value.ToString();
            customer.NumberOfEmployees = int.Parse(dataGridCustomers.SelectedRows[0].Cells[3].Value.ToString());
            customer.ContactPerson     = dataGridCustomers.SelectedRows[0].Cells[4].Value.ToString();
            customer.PhoneNumber       = dataGridCustomers.SelectedRows[0].Cells[5].Value.ToString();
            customer.Called            = bool.Parse(dataGridCustomers.SelectedRows[0].Cells[6].Value.ToString());
            customer.Waiting           = bool.Parse(dataGridCustomers.SelectedRows[0].Cells[7].Value.ToString());
            customer.Contract          = bool.Parse(dataGridCustomers.SelectedRows[0].Cells[8].Value.ToString());
            customer.Done  = bool.Parse(dataGridCustomers.SelectedRows[0].Cells[9].Value.ToString());
            customer.Notes = dataGridCustomers.SelectedRows[0].Cells[10].Value.ToString();


            AddEdit_Firmu dlg = new AddEdit_Firmu(customer);

            if (dlg.ShowDialog() == DialogResult.OK)
            {
                PopulateCustomerList();
            }
        }
        private void AddCustomer()
        {
            AddEdit_Firmu customers = new AddEdit_Firmu(new Customer());

            customers.ShowDialog();
            PopulateCustomerList();
        }