private void btn_addCustomer_Click(object sender, EventArgs e)
 {
     using (CustomerED customerED = new CustomerED())
     {
         if (customerED.ShowDialog() != DialogResult.Cancel)
         {
             txt_search.Clear();
             txt_search.Focus();
             btn_clear.Hide();
             this.loadCustomer();
         }
     }
 }
 private void dgv_customer_CellClick(object sender, DataGridViewCellEventArgs e)
 {
     if (e.RowIndex > -1)
     {
         string customer_id = dgv_customer.Rows[e.RowIndex].Cells["id"].Value.ToString();
         using (CustomerED customerED = new CustomerED(customer_id))
         {
             if (customerED.ShowDialog() != DialogResult.Cancel)
             {
                 txt_search.Clear();
                 txt_search.Focus();
                 btn_clear.Hide();
                 this.loadCustomer();
             }
         }
     }
 }